Root fart

A large fart that comes after a series of smaller farts; The epicenter of one's flatus.

Roommate #1: Dude, will you please stop farting? The whole living room smells like your ass.

Roommate #2: I've already told you, I'm waiting to get out this root fart and it will all be over. If I try to force it it will only embed it's roots deeper within my bowels.

Roommate #1: You're out of your mind, you know that, right?