Bubkes (pronounced bub-kiss) is a Yiddish word that means something akin to "hooey," "nonsense" or "baloney" in the English language. It is used to refer to something with little or no perceived value. Some experts believe bubkes is derived from either a Russian or Polish word that means "beans."
When used in a sentence bubkes usually has a negative connotation. For example, if you don't like something you could say "That's bubkes!" to express extreme disapproval.