Top definition
Jackin it - The slang term for masturbate

-bat·ed, -bat·ing.
–verb (used without object)
1. to engage in masturbation.
–verb (used with object)
2. to practice masturbation upon.
Origin: 1855–60; < L masturb&#257;tus, ptp. of masturb&#257;r&#299; to engage in masturbation

—Related forms
mas·tur·ba·tor, noun Unabridged (v 1.1)
You: Where is Nick?
Me: Oh, he is at his house jackin it to some porn.
by SpERRM November 05, 2007
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