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Random
Congestion of the sinuses due to (male/female) ejaculate protruding the nose, typically from the act of oral sex.
"Dude, I was eating out my girlfriend last night and she came so hard she gave me the cum sniffles!"
"Gross!"
when you make a woman deep throat you and she exhales as you ejaculate, forcing semen out her nostrils
... no explanation needed (cum sniffle)