1) A burning sensation of the anus regardless of cause, which can be many; diarrhea from spicy foods, anal sex, etc...
2) A person who is elevated in loathesomeness to the next level beyond being a pain in the ass such that now is more of a burning rectal sensation rather than merely a simple pain.
When I had the squirts last night it was a real buttpepper.
Sally had a buttpepper and didn't shit right for a week after the football game party.
A term used to lightly insult others when a stupid or funny error has been done or said. Can also be used as a positive comment in regards of someones pleasantpersonality or personal excitement.
"That was such a dumb move, you buttnipper!"
"That was a buttnippin game dude!"
"Buttnipper U.S.A!"