To pass out after or during masturbation.
Joe- The other night I must have wacked out because I woke up in a puddle of semen... I seem to wack out a lot.
by Sethgz May 02, 2009
to kill someone (in secret, not infront of anybody)
why would a pro brother wackout a 72 years old retired sanitarian worker
by mannas March 31, 2006