What is A/m?
1.
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.
See
2.
Abbreviation of
OMG look at blah's new a/m!
See