Here are the terms I use and want credit for when they are commonly used.
Omega
Use it as a substitute for "oh my god/gosh" and "OMG." It is superior because it takes nobody's name in vain. Also, it can be shortened to a symbol ( Ω ) so it's efficient, too.
Threelationship
An easy way to talk about a "house (bed) of three" for the French-impaired.
Silent Duck
It's a duck that never quacks. He is always silent.
Carbon Dating
The act of dating or pursuing people much older than oneself.
Grave Robbing
The same thing as carbon dating, but referencing the popular term "cradle robbing."
Goldilocks / Den Mother
Girls who dig big, hairy guys.
Royal She
Use it to make fun of a group of women who are similar. (Example: "She looks terrible." "Which one? They both do." "I meant the royal she.")
Crap, I'm blanking out. Please reply with things I say a lot that I made up and I'll edit this and explain them.