Fine clusters of excrement that have solidified on the ends of pubic hairs in the rectal region.

Also double as excellent munitions.
Andrè plucked a butt raisin from the crusty rim of his anus, flicking it nonchalantly at the other people on the bus.
by Professor Rape PhD July 28, 2003
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That unfortunate small bit of poo that gets stuck in your crack. It's missed in the general wipe/cleansing process but ultimately is discovered due to it's odor.

Sometimes the only poo that comes out when constipated, little bits.
I'm so constipated all I can pass is butt raisins.
by Southern Cook again January 15, 2009
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The small, stubborn slivers of shit that come out of your ass after you're finished with a dump. Nothing comes out unless you strain every muscle in your ass for 20 minutes until you finally release the butt raisins.
Man, my asshole is empty, but those butt raisins really put a toll on me *huff* huff*
by Bob Brown November 9, 2007
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The act of extensively clenching one's butt cheeks forcefully together until the point where the skin of the gluteus maximus dimples, forming what looks like a wrinkled raisin. Must be done without the use of hands or assistance from others.
Anna successfully avoided anal penetration at the party by doing raisin butt.
by pfdjkbuer8k December 14, 2016
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