Top Definition
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
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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