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When a guy ejaculates into their partners nose, shooting cum up their nose.
"My nose has been running all day"
"Why's that? Did you get a nasonex last night?"
Nasonex by Ashleytuff February 29, 2008
Related Words
When one (man) is recieving oral sex from one (woman/man.) The reciever will then take his (penis) out of the oriphice of the giver and (ejaculate) in the giver's nose.
My girlfriend had a sinus infection, so i gave her a shot of nasonex and she felt much better, but she smelled like burnt salt.....and cum.
Nasonex by Nizzim (Sf'ing Mf'ers) December 31, 2004
When a male inserts his dick into a chicks (or dudes) nose.
Just like the medicine nasonex for allergies.
nasonex by Logie Wogie & M Shon March 27, 2011

Nasonex Surprise 

A "nasonex surprise" is when a male ejaculates into his partners nostrils by surprise while recieving oral sex.
John gave me a nasonex surprise and I haven't been able to smell right since.
Nasonex Surprise by Sallysixtoes November 17, 2010

Dirty Nasonex

After receiving a blow job, holding a girl's mouth closed and blasting your cum up one nostril. Optional to make the Antonio Banderas bee voice while you're doing it.

Related to the Dirty Visine

Nasonsex 

When a male ejaculates up a girls nose to help clear her sinuses.
Nasonsex, powerful relief from common allergy symptoms
Nasonsex by Jermanian September 8, 2010