free gaff Share definition Flag Crazy party that is held when some1s parents go out of town and every1 comes over and drinks themselves in2 stupors!! Hey my parents are going away to seychelles tomorrow lets have a free gaff!! free gaff by Robert O'Connell-Kilroy August 29, 2005 0 0 Get merch Get the free gaff mug. Buy Now — $32.95 See more merch