When the words "cunt" and "ass" are merged together. Also when someone is being extremely ridiculous, ignorant, and/or stupid.
Dad: I wanna watch football!!

You: NO! I want to watch Full House!!

Dad: No, we're watching football, and that's final!

You: Pssh, you're being a cunnass...
by Ray_Jas007 June 18, 2011

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