In the simplest of definition, a man child is an immature guy who just refuses to grow up. This doesn't mean he necessarily lives at home with mom and dad ― although he probably should considering the way he functions in the real world ― but that he just doesn't have his life together.
“Hey man what is a man child
“Go watch Erobb221, Lime
by GradualMist April 3, 2021
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Grown man who acts like a child, in other words Donald Trump
Can't believe he did that, what a man child
by beautifulelf September 24, 2017
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(Australian context) A boy who goes through puberty at a very young age, and is usually the tallest and oldest looking amongst his peers between the ages of 11-13. After that, he stops growing, and his peers go through puberty and become the same size/taller than him in the later teenage years. Despite this, however, a manchild will retain his characteristically mature features well into later life.
twelve year old boy1: dude, that guy over there has already started shaving. And he's like taller than all of us.

twelve-year old boy2: Yeah, he's such a man child!

(4 years later)
16-year old boy1: Hey look, it's the same guy we were calling a manchild 4 years ago! What happened man, he used to be taller than all of us, now he's like 5'9.5'' and we're all 6'1'' !!

16-year old boy2: I know, he's actually the same size he was when he was 12. But dude, he's still a manchild- look at his awesome stubble and hairy arms!
by AusDesi August 15, 2009
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A man that expects a woman to support him financially. Somehow always forgets his wallet at home.
Man child wants the ladies to take him on a date.
by Rica Spice August 17, 2018
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Often displays one or more of the following characteristics:

1) Games like there's no tomorrow

2) Finds it impossible to step out of the party/frat boi phase for some reason oh wait... Because he's a child

3) So irrational makes you wonder if he was ever sober while talking to you

4) Faces difficulties in comprehending basic statements

5) Does not engage in any form of a matured conversation but runs away from everything, sometimes even acts like you or everything else is to be blamed

6) Almost makes you feel like a fucking generous babysitter offering her service for free of charge
Oh look The Man-Child... Run!!!
Jeez Tom don't be The Man-Child aka a pain in the ass
by Trollqueenb35828 November 25, 2018
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a grown man who is very immature, therefore considered a man child.
Dude you need to grow up and stop being such a man child
by rhoni March 6, 2005
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