A.M. 

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

A.M. by Beast404 September 13, 2006

A.M. 

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!"

A.M. by Kirke February 17, 2009

A.M. 

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"

A.M. by 7aipan September 8, 2006

A.M. 

At Morning

I have to wake up at 9 A.M.

A.M. by awesome_girl2000 April 24, 2015

A.M. 

A.M. stands for “Annoying Mom”, who is usually very obnoxious, narssistic, irresponsible, loud, and simply unnecessary. An “A.M.” can be totally obsessed with her anti-aging skin products, cosmetics, clothes, accessories, as well as taking selfies of herself. (AND plastering then around the house)

A.M. makes unnecessary comments about people’s appearance to make herself feel better, and is also very focused on health and beauty.
Overall, an A.M. is a very unfortunate person to have as a parent. For those with A.M.’s out there, I am very sorry and also, move out ASAP.

Child: “My A.M. compared me to another “beautiful” person again.”

Friend: “Wow... I’m glad I have nice parents.”

A.M. by egg_yolk May 11, 2018

a.m. 

At.morning.

It's nine a.m., time to get ready for school
—Jimmy

a.m. by air can pee August 17, 2021

A.M 

A.M slang for an Attempted Murder. Used heavily in UK.

" I just caught A.M last week then went and burned down my clothes - young dizz"

A.M by Lendary stat October 20, 2019