(n) in real life, the sound created by an awkward fat person slipping on a banana peel, briefly flying into the air, and then tragically falling to the ground.
see also, hooip, whip
A: did you hear that sound?
B: sure. i think somebody just slipped awkwardly on a banana peel, briefly flew into the air, and then tragically fell to the ground!
A: yep, that was quite an uip