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When someone passes out (or it could happen during kinky sex, you decide) and someone else (usually of the opposite sex) bends over and takes an enormous crap on the persons face while simultaneously rubbing their ass cheeks into it, creating a sludgy pool of human feces all over the persons face.
"Yo, Dean, what did you do with your new girlfriend last night?"

"Rob, I moonfaced that bitch!!"
moonface by Stuntz March 16, 2008
Jessies steroid face with chickenpock craters.
"Jessie, your face is very fat and round today, you must have moonface."
moonface by yessica! yallen! April 22, 2004
(noun) Somthing Devin Nunes Cow, tells Orange people to call Asians.
Becky would you look at the sise of that moonface
Moonface by #Justsayin May 6, 2020

Spanking the moonface 

Another slang for masturbating, pleasuring ones self or fingering.
May be used in conjunction with beating the pufferfish.
Person A: What are you doing?
Person B: Beating the pufferfish.
Person A: What the actual....?
Person B: You know, spanking the moonface.
Person A: Ah.... I'll leave you to it then.
Spanking the moonface by Tbell November 9, 2014
When someone has exactly the same facial expression in every selfie.
"Oh God, I was looking on Facebook earlier, and Sheena is pulling that monoface of hers in like six consecutive selfies."
Monoface by Cartoon Hero May 19, 2014
A girl with fat face. The face swells to give a moon like appearence.
Man that girl sure has a fat moon face. It looks fat and puffy.
Moon Face by Erol Morkoc December 5, 2005