What is A.m.?
1.
A.M. or "ante meridiem" means "before noon." Anytime after 11:59 P.M. and before 12:00 P.M. is A.M.
If it is A.M. it is morning.
It's 1:51 A.M. and I should go to bed
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2.
Someone who doesn't spend there time wisely or doesn't go out very often and is unsocialable.
"What an A.M. he never comes out!"
"Going out and getting nothing? A.M!"
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3.
short for describing the morning hours of the day.
"...Wake up in the A.M., compose a beat
I bring the fire til you're soaking in your seat"
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