Fart, flatulate, break wing, pass gas.
It comes from the Blackadder episode "Beer"
(Lord Melchett has a hangover, but Queen and Nursie think he's sick)
Queen: Well, hurry up and cure the horrible man -- I'm fed up with him lying there moaning and groaning...
Nursie: ...and letting off such great and fruitsome flabby woof-woofs! One can scarcely believe one's tiny nosy!