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1. buttnut
similar to a fucknut, but toned down for your grandmother.
by semoore Sep 4, 2003 add a video
2. Buttnut
A person who tunes pianos
I'm looking for this piano tuner. Yeah, the buttnut.
3. buttnut
something you call your little brother regularly and is topped off when accompanied with a noogie.
see above for other examples of the term buttnut
4. Buttnut
An insult much like Buttface but much more gruesome and always brings the victim of your insult to a loss for words.
You Buttnut you smell of rotting cheese.
by Corrie Jul 11, 2005 add a video
5. buttnut
Climax experienced as one finishes fucking another in the ass.
Hey, Devon, did you buttnut that shit last night?
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