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A prenu is a subtle way of calling someone a prick. Comes from the welsh accent of saying Prick en you. In other words, you're a prick aren't you. Prenu is a shorter word for that phrase.
Phil says to Darren: Prenu!

Darren says to Phil: Whats that?

Phil says to Daren: You're a prick en you? Prenu

Darren: That was very subtle, i like it. Prick en i!
by Phil En i August 22, 2011
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