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Balls so hairy that they are not visible to the naked eye.
Holy crap! My dads got mumple frumps!
by MacW October 22, 2003
When a dudes balls/scrotum is completely covered with pubic hair.
Yesterday while in the shower after practice, me and all the guys on the team noticed that Josh has mumple frumps.
by surfer20 May 17, 2005