A spontanious beating of the shaft. It is a very uncontrollable sensation. This is very common when one is hard.
Wayne: Man, my wacking shaft is really uncontrollable.
Courtney: That's understandable, wacking shaft happens to alot of guys i know.
Emily: Yeah, my brother had wacking shaft the other night
Courtney: That's understandable, wacking shaft happens to alot of guys i know.
Emily: Yeah, my brother had wacking shaft the other night
by Balllllsack July 9, 2010
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Get the Hella Wack mug.Male masterbation. Commonly used as a slang term describing the sexual acts of one, like "Beat the Meat."
by Paso Robles Slang March 9, 2010
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Get the wiggity wack mug.by Elizabeth n Nick April 10, 2006
Get the Mad Wack mug.To have the sudden urge to masturbate in a public place, usually a restaurant, and to then start beating off savagely.
by d00d April 27, 2004
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