Top Definition
The act of self pleasure while listening to dubstep or any other bass heavy music.
Toby: Did you see Danny at that Excision concert last night?
Luke: Yeah man, he was totally masterbassing all over the place.
Toby: And when that bass dropped?
Luke: Yeah...I'm pretty sure Danny had to change his pants afterward.
by whitepeoplelikedubsteptoo! January 30, 2011

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