Copasheshy, kōp-ə-SHēSHē also spelt Copashyshy, is an uncommon term used by beatniks and druggies.

Copasheshy generally means 'all good' similar to terms like "no biggie" or "she'll be apples". The term was popularized by the 2010 video game Fallout: New Vegas, in which a character named Jack (found at the Red Rock drug lab) says many random terms including "Copasheshy" when told about what Caeser's Legion will do to him and another drug trafficker found at the drug lab named Diane.
Person 1: "The Legion will kill you and sell Diane into slavery as a prostitute."
Person 2: "Dude! What a total haul! No way that's copasheshy."
by Swialp June 18, 2023
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