When you begin by gently fisting your partner, imitating the connecting road of a steam train(link from the engine to the wheels). Slowly picking up speed much like a train itself. Once you have reached maximum speed you can manage, you yell CHOO CHOO, spouting two glorious arks of semen vertically in the air to mimic the puff of steam.
I Choo-Choo Trained my girlfriend so hard last night, she loved it, she didn't stop screaming the whole time.
When two homosexuals choose to play the rodent game (sticking a rodent into one's bum) and they put a tube between the two, the partner with the rodent inside him farts in order to try and get the rodent to run into his partner's bum.
Wow! did you see that hamster run from Frank's bum to Steves? that was quite a choo choo train
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).