Involuntary expulsion of male ejaculate out the nose, occuring during fellatio, as if the woman is sneezing semen.
When I blew my monster load in her mouth, she accidentally sneemened all over the place.
by DaytonaDude October 03, 2011
The end result of semen that has passed through the nasal cavity.
"After giving much head, Alexa couldn't figure out how to get the sneemen stain out of her shirt."
by Minkis November 17, 2007