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When fucking a giraffe in the ass, the small tuft of hair on the end of its tail is used to gently tickle the scrotum for pleasure.
Small child:Mommy what's that dirty dirty man doing to that adolescent giraffe?
Mom:Oh don't look honey, it's just the nut duster, you'll understand when you're older.
by Steveshiftyshaft January 17, 2011
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