Quote (Arsenic_Touch @ Dec 2 2011 06:20am)
It's called a vibraslap.
http://www.youtube.com/watch?v=qs630Uq5tjU
Here's a good example of it. 0:11
Looks like this.
http://upload.wikimedia.org/wikipedia/en/3/37/Vibraslap.JPG
saw cake the other night, dude used this...everyone freaked out cause no one knew wth it was