A toy at a store that kids don't want (usually the toy of a sidekick, disliked character or female character, etc) that remains on shelves for months on end after all of the "cool" figures have been sold. Based off of the term benchwarmer
Toy Collector A: Hey, have you seen ROTF Sideswipe lately?
Toy Collector B: Ugh, no, our Target's packed with nothing but shelfwarmers like Arcee and Wheelie.
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).