or mau5 off: the act of masturbating to, near, or while listening to the electro music sensation deadmau5. Also known as mau5turbating or beating the mau5.
Joel: Yeah dude, I just finished my new dub5tep song, did you hear it?

Tommy Lee: Yeah dude, It made me mouse off. Shit was so cash
Joel: Awh man, Suck it, Noob.

Tommy Lee: Whats a noob?
by lolcatswut April 18, 2010
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an extra mouse laying around that the user puts in place of the main mouse. the user can then proceed to use both dick infected hands on this mouse. It avoids having to wipe your main mouse again when your right hand just wasn't cutting it enough. the beat-off mouse does not have to be cleaned.

inconsiderate assholes only use one mouse. your friends use that computer too, buddy!!

Same thing goes for the beat-off keyboard
God Danit Jim!! My hand is all sticky!! Did you switch out the beat-off mouse!?!
by Chenry08 August 24, 2007
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