To scratch one's own genitals as if masturbating
A: Hey, why are you scratch-tubating?
B: I need to scratch-tubate 'cause it feels like my dick is on fire. It must be a sex thing...
A: Holy shit, yo're crawling with crabs!
(from "The Big C", season 2, episode 4)
by Tara13 January 15, 2014
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