Calling someone a cuscus face is degrading and insulting but somehow still falls under the category of a "joke". Cuscus is the short new definition of couscous.
couscous Definition #4; is "The female genitalia also known as putang, pussy, or vagina."
Guy: "Dont be a cuscus face"
Girl: "Ah fuck you!"
It can be used as "Dont be a vagina face, pussy, cunt, etc."
Slang for sex or coitus between two or more human beings. Used in Mexico City by teenagers to mean sex without saying it directly.