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1.
A fool who beggars belief
"What in God's name are you doing you prannock?"
by M.A.B November 23, 2006
 
2.
A cross between prat and pillock, a prannock is an idiot of epic proportions.
Jesus, Kanye West acted like a complete prannock at the VMA last week.
by Allie-cat September 25, 2009