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Three Dog Night
It refers to being cold. Often when ranchers or cowboys were out on the range they would have to sleep with their dogs to keep warm. A one dog night was a night when he had to share body heat with one dog, two dog night was two dogs and a three dog night was an extremely cold night where he would have to share body heat with three dogs. “how cold was it on your trip?” “It was a three dog night”.

Third World
Originally a French term (Tiers Monde), it was coined by G. Balandier in 1956. The First World refers to the industrialized West (like the USA), the Second World refers to the Communist nations of the Soviet Union and Eastern Europe, and the Third World refers to all the other countries.

Third times a charm
While your first two attempts may have not been a success, the thrid try is good luck. American origin. The similar phrase 'third time lucky' is used in the UK..

Top Drawer
To go first class. Whether it refers to clothes, food, travel. Eg: we went top drawer

Tie the knot
Since bed frames were sprung with rope. To make yourself a marriage bed you had to 'tie the knot'.

Top Notch
Top notch is just another way of say, "Excellent". American origin - following on from the British 'topping', and preceding the US 'the tops'. All meaning the same thing.

Thats all Folks!
Banner shown at the very end of a Bugs Bunny cartoon.

Three Sheets to the Wind
Refers to when someone has had too much to drink and is therefore unsteady. When I visited Nantucket Island - which has several windmills, that the operators would adjust the number of sails dependent upon how strong the winds were. One rule that they had to follow was to always keep an even number of sails (either 2 or 4), opposite each other so that the windmill remained balanced. If they ever had 3 sheets, the windmill became unbalanced and extremely wobbly and unsteady.

Twenty three skidoo
An american orginated Idiom (1920's) that means 'let's get out of here.

Turn A Blind Eye
Just stopped by the site on idioms and sayings and noticed that you were missing one I've used forever. 'Turn a blind eye' which stems from the battle at Copenhagen between the British fleet commanded by Admiral Sir Hyde Parker and the Danes (can't remember who commanded it). The attack was led by the famous Admiral Nelson into the bay and during the battle there was a point where Parker had felt that Nelson's losses were unacceptable and hoisted the signal to disengage. When informed of the signal Admiral Nelson held the telescope to his blind eye and said "I see no ships" disobeying the order and winning the battle. Thus the phrase 'turn a blind eye'.

The Wave
The "wave" was actually originated by A's fan Crazy George Henderson onOctober 15, 1981 in Section 331 of the Oakland Coliseum in Oakland,California. There was speculation that the wave originated at theUniversity of Washington during a football game, but it was a couple weeksafter Crazy George started it.

The Truth Will Set You Free
This is obviously a very common saying, and Jesus states in John 8:31-32, "So Jesus was saying to the Jews who believed in Him, 'If you continue in My word, then you are truly disciples of Mine; and you shall know the truth, and the truth will make you free.'"

There's more than one way to skin a cat
In other words, there is not only one way to achieve a goal. Skinning in this idiom may mean to beat and cats may have suffered.

Tongue In Cheek
To keep yourself from laughing at a bad time, you can thrust your tongue into your cheek. Back in the 1700's, this was used to signal contempt for another person. Over the years the meaning changed to be more humor related.

Three strikes and you are out
Originally a baseball term. This phrase was used by US President Clinton as a slogan for his policy of long term jail sentences for three-time offenders.

To Make A Long Story Short
"Usually the phrase repeated by a person telling a boring, long-winded story, but who has no real intention of actually shortening the story at all. When you hear this phrase, you know you're 'in for the long haul'."The origin of this phrase probably dates back to Old English times - long before tv, the internet, or computers came on the scene - w/ guys like Chaucer who used to travel around the countryside with nothing better to do than to tell boring, long-winded stories that no one wanted to hear.

Til the cows come home
Meaning a long and indefinite time. This phrase was paraphrased Groucho Marx in Duck Soup. 'I could dance with you till the cows come home. Better still, I'll dance with the cows and you come home.'

To Everything There Is A Season
This is a famous song "To everything/Turn, turn, turn/There is a season/Turn, turn, turn" of the 70s. I forget who sang it (Jefferson Airplane, maybe?) because I'm not a child of the 70's. Anyway, the song takes quite a bit from a section of the Bible: "There is an appointed time for everything. And there is a time for every event under heaven: A time to give birth and a time to die; A time to plant and a time to uproot what is planted. A time to kill and a time to heal; a time to tear down and a time to build up. A time to weep and a time to laugh; a time to mourn and a time to dance. ... A time to love and a time to hate; a time to war and a time for peace." (Ecc 3:1-8)