1. adj; something in bad taste or is otherwise unappealing.
2. verb; to murder someone.
3. verb; to masturbate.
1. Yo Freddy, turn off the country music. That shit is whack.
2. Freddy, turn off that fuckin' country music before I go and whack ya.
3. Freddy, I said turn off the country music, I didn't say pull your johnson out and start whackin' it. The fuck?