Top definition
oral sex involving pushing the giver's head into the receiver's pelvis so hard as to injure the face of the giver.
I monster-faced your mother so bad last night, she lost most of her teeth.
by Norristonian April 18, 2004
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2
The act of simultaneously ejaculating and passing a kidney stone on a woman's face.
"Dude, I gave Jenny a Monsterface last night and now she won't call me back."

"I was screamin' like Goku giving Martha the ol' Mosterface bro!"
by Vibekilla June 29, 2016
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