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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
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Jun 6 Word of the Day
A man who messes around with other men, but no one would ever know by looking or talking to him. Used by gay black men to identify masculine gay men or DL Brothas.
"I am going to the mall to look for some trade"
"The club was packed with trade, honey"
by Darren December 03, 2004
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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
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