Top Definition
An adorable and sexy guy's butt. His butt looks like two peanuts squished together, to create a firm and cute butt. I am in love with this guy and his butt is just the cutest thing ever! (Also known as Cooper)
"Would you look at that butt, it is so small, yet still so sexy!"
"That is because he has a peanut-butt!"
by Buggaboo2coop August 18, 2011
1 more definition
The last 10% of a Peanut Butter jar that is so hard to get to with a knife.
Dave opened up the peanut butter jar and exclaimed "Aw man, all that's left is the Peanut Butt!"
by PDXWaterproof June 12, 2015

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