The sound arm fat makes when it is hot, sweaty, and pressed against more arm fat. sounds much like flatulence. Usually heard during two fat people having sex.
Tom: Oh my god dude!

Dick:What?!

Tom: You didn't hear that?!

Harry: Those fattys were totally fhweefing while they were having sex!
by Yipeestalker3 June 21, 2009
Get the Fhweef mug.