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You live in a densely urban area, lots of pollution. You come home and blow your nose and see black boogers from all the smog and pollution. City snot - gross!
"I was walking around downtown yesterday all day for a city tour."

"That's cool! See anything interesting?"

"Yeah...the black shit that came out when I blew my nose just shows how filthy the city is."

"City snot!"
by Snotty 'n surviving August 11, 2008
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