Prrrt

Prrrt is simply the written sound of farting. It's commonly used on the Jedi Knight: Jedi Academy game scene, used after owning someone badly or just when someone is fooling around. The number of rrr in the word defines the lenght of the fart, so it can be very short fart "Prt" or very long one "Prrrrrrrrrrrt".

The sound of a trombone. Used to describe a slut or in an awkward situation.