The name for cotton remnants that become wedged in your anal crevasse after wearing boxer shorts, or some other sort of undergarment.
Bob: "Why are you taking so long in there? I gots to make some clay!"
Jeff: " I'll be another few minutes, my Joe Boxers left a 10-footer of flerf in my ass!"
by Gnarltar August 08, 2009
to use one's face as a toilet
I flerfed all over Nick Eyer.
Steven got a lap dance from a stripper and she flerfed all over him!
by mathew longshanks March 25, 2008

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