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1.An annoying residual goo which clings to the rim of the anus, the origin of which is most likely a foul bout of hellacious diarrhea.
2.Any smeary substance, no matter the origin, which has deposited on, or in the vecinity of the butthole.
3. A person whose behavior may be characterized the same way. Usually this person is not welcomed company.
"I had to throw out some undershorts yesterday before I could do my laundry at my girl's apartment. I had some nasty buttslime that left tracks on my shorts."

"I wish that buttslime Bill would shut the hell up, and leave already."
by SallieSunshine October 24, 2006
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