One who masturbates.
Tomtheloser is a mastur, although you'd be lucky to catch him admitting it.
by Eroticus Prime November 26, 2004
One who takes great pleasure in giving themselves great pleasure.
I am a mastur. But then again, so are you.
by Tom The Loser November 27, 2004
One who has mastered the holy act of Masturbating.
dude, Jimmy is such a mastur

yah i know, i'm his roomate
by slarfuggle June 09, 2008

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