1 definition by Balllllsack

Top Definition
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
#beating off #wacking off #hard #penis #boner #ballsack
Por Balllllsack 07 de julio de 2010
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