Once I figured out how to spell this word (which came up in my 9:00 Myth and Culture class), it was pretty easy to find its origins on-line. From dictionary.com:
Main Entry: capeeshAnd from word-detective.com:
Part of Speech: interjection
Definition: do you understand?
Example: I will call you when dinner is ready. Capeesh?
Etymology: Italian capisce "understand"
Source: Webster's New Millennium Dictionary of English, Preview Edition (v 0.9.5)
What they're actually saying is "coppish" (kuh-PEESH, also sometimes spelled "capeesh"), which is definitely not Welsh (too many vowels, just for starters). It's Italian-American slang for "understand." "Coppish" comes from the Italian word "capisce," based on the verb "capire," meaning "to understand," and can be used as either a question or an answer. Like many dialect words born in immigrant communities, "coppish" affirms a bond between the speaker and listener. "Coppish?" thus often really means, "I know you understand, because you're one of us." And the reply "Coppish!" means "You bet, no problem, you can count on me."Capeesh?