Top Definition
The type of adult male that has long overstayed his welcome at his parents house and is taken in by his granma, who mollycoddles him and treats him like a prince. He usually ends up living in granmas basement mooching off her.
A group of BFF's are guy watching at the mall, when one asks the others, " Who is that guy ?"

Another girl says, " Forget about that loser, he's a mommomsboy."
by jpg3 November 11, 2010

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