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1.
The first piss you take after masturbating. This often results in a spray of piss coming out of your dick.
Guy 1: Dude! Why is there piss all over the wall?!

Guy 2: Hey man, I couldn't help it- it was a cum buster.

Guy 1: OK then.
by mrpopo123 October 03, 2010
 
2.
1. Term referring to a male who busts cum, i.e. likes to suck dix
2. Gay person
3. Often used as a general insult.
1. Dude, Steven likes to pants people. What a cumbuster.
2. See that guy in the plaid jacket? He's a cumbuster.
3. DON'T TK ME YOU FUCKING CUMBUSTER.
by Grif April 09, 2004