Top Definition
a milf possessing certain monster-like characteristics, like a strong desire to engage in kinky sexual activities very aggressively and for long periods of time.

Also a verb for the act of engaging is sexual activities with a so-called monstermilf.
Yo, i just got monstermilfed last night at Stephen's! Holla at cha boiii!

Sexual Willing Boy #1: how shall we go about obtaining pussy this fine evening?
Sexual Willing Boy #2: I could sure go for some monstermilf!
Sexual Willing Boy #1: Yeeeee nigga let's go!
by chillinashityo October 12, 2010
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