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
Free Daily Email
Type your email address below to get our free Urban Word of the Day every morning!
Emails are sent from email@example.com. We'll never spam you.