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
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