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.
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!
Sibley: But your ass isn't even fully grown! What a perv!
by golfcheater December 1, 2020

by bigslimedeo March 17, 2022

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

he got it goin' on
he got his own house
he got his own car
two jobs, work hard
he's a bad man
he has savings
he has credit cards
he has investments
he has everything prepared in the event of a disaster
he got a wife
he only been with one woman for his entire life cuz he didn't want any STD's
he is educated
he educates his own wife
he has full coverage health, life, dental, and vision benefits no copay
IF YOU AIN'T KNOW, SIT DOWN
he got his own house
he got his own car
two jobs, work hard
he's a bad man
he has savings
he has credit cards
he has investments
he has everything prepared in the event of a disaster
he got a wife
he only been with one woman for his entire life cuz he didn't want any STD's
he is educated
he educates his own wife
he has full coverage health, life, dental, and vision benefits no copay
IF YOU AIN'T KNOW, SIT DOWN
"A grown ass man took me on a vacation after he paid all of the bills and put away money for the future."
by Vita Smart August 14, 2022

This guy at work always likes to say, ‘Hey, you’re a grown ass man’ whenever people complain. So I waited for him to complain, then I said, ‘Hey you’re a grown ass man,’ and he got this pissed off look on his face and didn’t say anything.
by SiL3Nt J September 17, 2023
