This occurs when the amount of sperm flowing into her mouth overwhelms her swallowing ability and the jizz begins to overflow through her nose causing a reflexive sniffing of the goo, in a attempt to not waste any of the special sauce .
Mike asks ,"Busy night at the truckstop? She replies " Why yes babe, I made 25 dollars, but I got a badcase of the dick sniffles! Fifty cents a head is all they would pay, I sure wish they would pay by the pound instead, we'd be rich!"