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A person who can’t stop jerking off and is always thinking about it, even when they’re supposed to be doing something else.
My cousin is a jackaleptic. He tried to jerk off during math class and got caught.
I saw my neighbor’s dog acting like a jackaleptic. He was sniffing the mail and jerking off at the same time.
My friend’s mom says he’s a jackaleptic because he jerks off in the shower every morning before school.