1- Used to reply angrily to an absurd suggestion

2- Used to ridicule a childish person
1- "That papercut looks pretty bad, do you need a band-aid?"
"NO NIGGA! IM A GROWN ASS MAN!"

2- "Ow. I got a papercut and it really hurts."
"You a grown ass man, stop crying like a bitch."
by Dub-Fresh May 1, 2007
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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 18, 2013
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A man whose ass is fully grown.

A very popular and time tested description of a man who is fully grown physically (which usually completely ends around age 25) and who is simply an adult, but does something an adult shouldn't do, such as not paying the bills or sleeping in too late, or neglecting his child(s). After the event, it is then considered that he is a fully developed man, and as such he is then called a "Grown ass man" as a tongue-in-cheek insult. Usually has a big butt.
Jessica: Girl, you wouldn't believe it - this GROWN ASS MAN was checking out my butt at the grocery store and then asked me out!

Sibley: But your ass isn't even fully grown! What a perv!
by golfcheater December 1, 2020
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when an adult does or says something childish or something a teen would say
"Aw yes your so cute I just wanna cuddle you"
NIGGA YOU ARE 26. YOU. A. GROWN ASS MAN.
by bigslimedeo March 18, 2022
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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 18, 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 13, 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 May 19, 2012
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