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1.
a/m
Actually masturbating. Only to be used when the person is actually masturbating (hence a/m). Kind of like 'mol' (masturbating out loud), but people use 'mol' when they are not masturbating.
Bob says:
Hey Aaron! Seen this chick I'm dating?

Aaron says:
a/m Bob, she's really hot.
by bong rouge December 10, 2007
 
2.
a/m
Abbreviation of away message
OMG look at blah's new a/m!
by EYIN! August 26, 2006