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1.
When someone smells something gross and says, "ugh, nasty! Do you smell that?" and you breathe deeply to take in the smell and confirm said nastiness, you have just performed a courtesy sniff.
George: Gross, I think the cat peed on my rug. Paul, will you come give it a courtesy sniff?

Paul: (bends face towards rug and breathes in) Dude, yeah, cat totally peed on your rug. Sorry, bro.
by pseudonym jr August 25, 2011

Words related to courtesy sniff

sniff ass blaaarghh courtesy fart friendship smell stink whiff
 
2.
The act of sniffing a fart after having previously been warned of the fart.
Mike: Damn, I farted.
James: *sniff* damn that smells like ass. courtesy sniff like a mutha fucka
by mike9 March 06, 2007