Physical reaction to a disturbing thought or image. The thought itself makes one physically pucker their ass muscles due to the actual thought.
When I thought I would have to hear Kenny G in concert, I immediately got the butt willies.
by JC Sears March 18, 2005
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The bearer of a muff butt, which is an unsightly patch of pubic style hair growing from and above the crack of one's ass.
Holy shit! I never noticed this before, but Jason is a muff butt willy!
by Anus Beeker August 11, 2007
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The act of placing one's finger into another anus for the playful enjoyment of one or multiple individuals. The finger may be licked prior to insertion similar to the Wet Willy procedure. However, due to the decreased accessibility of the anus the wetting of the finger is not imperative.
"Hey bro! Just letting you know i got my first Butt Willy today! I feel like a new man!"
by Hooch daddy November 18, 2020
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