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1.
When you sniff your toilet paper after you wipe your butt.
D: (comes out of the bathroom), Hey K do you ever sniff your toilet paper after you wipe? You know just to see if there is something wrong with you?
K: Oh my God that is so disgusting you are a poop sniffer...
by vsecrets April 13, 2006
 
2.
A poopsniffer is a person who likes to go around sticking their noses into other people's less than favorable circumstances.
Dude, you know I'm going through a divorce. No, you can't do my wife. You are such a poopsniffer.
by Sam June 09, 2003