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A guy who accepts responsibility for his actions, and carries on when the going gets tough.
Brendon is a grown ass man. He is committed, hard working and funny; generally, a pleasure to be around. He can take the ups and the downs, but always expects to be a winner.
by Little monkey October 17, 2013
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Being of the mindset of taking life head on instead of crying like a bitch.
DMX tried to car jack some fool while on crack and under the guise of a federal agent -- he's a grown ass man.
by Gibdaughter October 12, 2009
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(grown ass-man) what an immature male may inadvertently, though accurately call himself when others question his ability to do anything. The Ass-man is a cross between the donkey, popularly believed to be a stubborn and unreasoning animal, and a human being.
"Are you sure you can move that bed downstairs by yourself?"
"What do you mean 'am I sure?' I'm a grown ass man!"

1/2 an hour later...
"MY BACK!!!"
"Are you alright?"
*gritting his teeth through the pain* "I'm fine. Don't say it."
"Say what? I told you so?"
by sleep =D October 27, 2012
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A guy or girl the like, that is 'on top of thangs'. Essentially, responsible for his/her doings, and not settling for the subpar.
by Ivan Alfaro October 22, 2006
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grown ass person

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Anyone out of high school,who shouldn't care about such things as prep or goth social classes.
the world would be much happier if everyone seventeen and older was agrown ass person.
by Ashley snell April 3, 2005
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Grown Ass Kid

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Somebody who think they grown but they still live wit they parents,aint got no job, cant pay a single bill,cant take care of responsibliltys like a grown man would.........still act like a lil kid all together.
Girl he said,"Wat u wanna do about it cuz i cant miss school to take u 2 da doctors!"

An i replied,"But u can miss school to get down but u cant 2 handle buisness, i swear i aint never heard of a Grown Ass Kid on da real!"
by Nicole Green December 29, 2006
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Grown Ass Baby Manchild

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When your an adult and you can't act your age, or, you can not for the life of you handle your alcohol.
When you see a man acting like a child and they are definitely an adult. When you see a drunk man trying to fight everyone. Then you call them a Grown Ass Baby Manchild.
by BerryBitch December 21, 2012
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