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A male between the ages of 19 and 31 that is usually the boyfriend of a single mom. They are usually too immature to act as a role model and have a tendency to either be too inept to help watch children and do other parent stuff, thus becoming a burden; or will beat/kill a child over something that's not a big deal, for example, a video game.
Person no.1: did you see her boyfriend
Person no.2: yeah, dude looks too much like he could be a step-manchild
He’s smashed out of his face on manchild’s brown treacle.
A boy who wants to act like a man/be treated like a man, but acts like a child in situations with women.
An adult man who doesn't quite act his age.
Can you not be a manchild for two seconds? We're working!
A man who acts like a child. Full Stop.
Manchildren don't have maidens, for some more info.
A grown adult that acts very immature on the internet, rarely in real life, like a child. These adults are very loud and arrogant, annoying or straight up immature and stupid.
You usually see these people on youtube, mainly kids content / click bait.
Guy 1: That clickbaiter is so lame!
Guy 2: IKR, such a manchild!