word used to describe someone or something that is fake or something that is a lie.
example one:
"that stuck up bitch with the pound of makeup caked on her face is counterfeit as fuck."
example two:
"if i ever catch you trying to buy anything from my shop with a counterfeit bill, ill blow your fucking head clean off."
example three:
"she keeps telling me she loves me, but to me it seems pretty counterfeit."