A person who will often partake in the act of sniffing another's anus or sphinctal region. No one is a true butt-sniff unless they truly enjoy the act off butt-sniffage.
Person 1 bends over
Butt-sniff sniffs the rear of person 1 with a satisfied look on their face
Person 2: God you're such a Butt-Sniff
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When you snort a line of coke off a thick Brazilians ass
Man, did you hear James did a Brazilian Butt Sniff at the party last night?
Having the quality of something nasty, but in an oddly humorous way.
"Dude, did you see Sally throw up the other night?"
"I did! It was butt-sniff-alicious!"
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