An idiot; a loser; another term for jerkoff.
That guy is such a wack job.
by Emby Quinn October 22, 2003

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A crazy person, but not in the good or cool kinda way, they constantly do stupid stuff and say stupid things and no one understands them, they usually can't get a girlfriend(or boyfriend, depending on the gender or sexuality) and can really get on your nerves.
Jordan kept bugging me, he kept poking me and yelling me 'anime walruses lurk in your watermelon potato salad' and he kept trying to lick my friend, for he is a freaking wackjob.
by AGuyWhoLikesNachos June 08, 2013

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to masturbate, or give pleasure to one's self. Mostly used to describe male masturbation (jack off) but can still be used for female pleasuring.
'Dude why is Riley taking so long?' 'he's giving himself a wack job'
by smartblondeawsomeperson;) February 01, 2010

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there r 2 contexts in which "wack job" can be used

1) as an insult, similar to "jerk off" or "wanker"
e.g - that guy is such a wack job

2) giving ones self sexual pleasure (masturbation), similar to wanking yourself off
e.g i want a wack job
e.g 1) - That guy is such a wack job

e.g 2) - I'm in the mood for a wack job
by day day July 24, 2004

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slapping one in the face with an erect penis until one ejaculates.
man slaps woman in face with penis, then ejaculates (wackjob).
by htes23 July 05, 2011

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An ecentric individual prone to odd behavior, ie. sitting and rocking, twiddling thumbs, mumbling incessantly about helicopters, and outbursts of lewd indecent exposure
JJ was ok, but now that wackjob is off his rocker.
by Joceppi August 04, 2003

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A quack, crackpot, or insane mofo. Usually prone to delusions of paranoia, schizophrenia, and any other fun mental image seen on tv.
Mulder, were he not brilliant, would be wackjob.
by The Omnipotent Seal March 30, 2003

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