Top Definition
To have sexual intercourse with one's mother, who may be a milf. Often used as an insult in conjunction with a your mom joke.
"Dude, your mom is so hot I think I'm going to mompound you when your dad's not home."

"When Jeremy mompounded John, he got genital warts because his mom insisted that he not wear a condom."
by Jeremy L. January 19, 2006

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