Actually the molecular structure of lysergic acid diethylamide, akaLSD or acid, a hallucinogen discovered by Albert Hofmann. Not coffee like the other dumbass said.
Bro 1: Dude, how far out is acid?
Bro 2: Dude, not that far. It's just carbon, hydrogen, and nitrogen; all of which are fairly common elements; combined into C20H25N30.
Bro 1: Oh.
Could you run down to Peet's and get me a very large and very hot cup of C20H25N30? And did i say Hot?? It had better be hot i can't stand luke warm C20H25N30.
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).