A celebratory exclamation, usually delivered with a squeaky or high-pitched intonation.

The last word--capowie--can never be spelled with a K. Ever. That would just be silly.
Larry: Oh my god!

Leslie: What is it, Larry?

Larry: I just got a new high score in Robot Unicorn Attack!

Leslie: YEAHYEAHYEAH WOWIE CAPOWIE!
by thegewddoctor January 11, 2011
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