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A large-sized dingleberry, which clings to the hair or wool around the anus.
When she examined her anus in the shower, her fingers encountered a butt nut the size of a soy bean.
by Al January 24, 2003
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similar to a fucknut, but toned down for your grandmother.
by semoore September 04, 2003
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The situation when Josh Wilson's nuts retreat into his butt, a sign of anger and bewilderment.
Josh Wilson got Butt Nuts after being called poor.
by Lost Endeavor October 13, 2008
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The result of a man in tight, khaki shorts sitting on a staircase with his legs spread wide open, so that the testicles are pressed tightly against the seam, creating an ass-like shape. Can also be used in replacing a noun.
That guy on "Trading Spaces" has buttnuts!

Hey, buttnuts, get over here!
by Buttnutz September 06, 2003
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One who is nuts for butts, that is, an anal sex enthusiast. Can refer to straight or gay people, though it is likely to be taken as offensive when used to describe a gay person.
Remember that girl I started hooking up with at the party? Turns out she's a total butt-nut. Fortunately, she's really anal about personal hygiene.
by Vulgaris Tunge April 01, 2005
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