(noun) One known for being less than intelligent. Having a low I.Q. and usually acts in a very retarded manor. Also used as a "G" rated version of jack ass.
A game in which two or more males (usually adolescent) attempt to earn what are called 'Banana Points' by pimp slapping each others testicles with the back of the hand at the most opportune and unexpected moments over an extended period of time. It is customary for a player to shout the name of the game when a slap makes particularly good contact.
Nebu: I think I'm going to order the crab salad.
James: Ballsack Wackalack
Nebu: Aaaaahhhh my balls, aaaaaah I'm gonna get you so bad...aaaaaaaahhh!
A person who sucks at life. They are incapable of performing basic and simpledaily tasks (with the exception of masturbation).
You have your left turn signal on and are clearly trying to merge into the left lane; instead of slowing down to allow you to change lanes, the Jackwacker behind you speeds up to block your access. This guy is a complete Jackwacker; he sucks at life.