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An exclamation said after being hit or kicked in the testicles to express pain.
Originated by actor/comedian Rich Fulcher from The Mighty Boosh and Snuff Box.
(Dixon Bainbridge kicks Bob Fossil in the crotch.)

Bob: (clutching groin) M'nuts!

(Bob promptly falls over.)
by Countess Nowakowska November 28, 2010
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