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
 Get the wacking shaftmug.
Get the wacking shaftmug. by .yA BoI. August 17, 2018
 Get the Hella Wackmug.
Get the Hella Wackmug. 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
 Get the Wack the Birdmug.
Get the Wack the Birdmug. by tooms July 30, 2008
 Get the wacked offmug.
Get the wacked offmug. by h*r fan March 3, 2004
 Get the wiggity wackmug.
Get the wiggity wackmug. by Elizabeth n Nick April 10, 2006
 Get the Mad Wackmug.
Get the Mad Wackmug. 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
 Get the wack attackmug.
Get the wack attackmug.