A small release of gas from the anus, but of a smaller quantity than that of a regular fart. One can release a series of fartlets and achieve the same rank effect as a whole fart.
Justin: "I just let out a bunch of fartlets when I was walking past that guy"
by Gitta January 05, 2007
noun: in sports, a form of punishment in which the punished must run around a track. The last person in the line sprints to the front, and then jogs; the newest caboose must then sprint, etc. etc. Activity continues until a) someone pukes; b) someone collapses, or c) until the coach is satisfied.
If I have to run any more fartlets, I'm gonna lose my shit.
by Smacfoo November 19, 2004