haggler - A non-Jewish person who thinks they can haggle like a real J

A non-Jewish person who thinks they can haggle like a real Jew and probably doesn’t know what that means.

"I’ll give you $5 if you let me have that jacket.", A haggler at the market

"I’m not Jewish, but I know how to haggle.", A guy at the store

"I’ve haggled with 100 Jews. I know what I’m doing.", A guy at the mall