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Get the Steps to that mug.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
Person no.2: yeah, dude looks too much like he could be a step-manchild
by Caesar_Destroyer_of_Normies January 14, 2019
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