sinus conception 

A sinus conception is when a man sends his nut up a woman's nostril.

Bro:" I sinus conception this chick so hard last night she had to go to the hospital"
Other Bro:" Dog, I know, that is one of the meanest sinus conceptions I've ever seen"

sinus conception by whydoyoucarefag August 2, 2017

Sinusconseption 

When u ejuculated into a nostrils of another

Sinusconseption was the reason she couldn't come to work

Sinusconseption by Cranium666 August 2, 2017