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1.
The act of masturbating while hanging upside down, as a bat would hang from the ceiling.
Did you see the man in the trenchcoat, doing the batjack from a lamp post?

He was batjacking on the chin-up bar.
by BatmanJackin' November 05, 2007
12 3

Words related to batjack:

bat fetish bats fetish jacking masturbation