what is a moose knuckle
moose knuckle â(usually uncountable, plural moose knuckles). 1  The ball joint of the humerus in a moose 's skeleton. ( 2 slang) The noticeable shape of a man's penis when he is wearing tight clothes.â¦] the VIP of the GOP, George W. Bush in full military flight suit, with his ejector harness giving him the worst moose knuckle in presidential history. ( 1 slang) The shape that is noticeable when tight-fitting clothing wedges between a woman's labia.