What is Sinus Infection?
1.
The act of sticking your dick up somebodies nose. This can be done as either a prank or to give pleasure to oneself.
I pranked my roommate by giving him a sinus infection. He had a runny nose the next morning.
See
2.
When a girl is supplying you with oral pleaure. Near the point of climax, the male quickly forces his "organ" into the females nostril. He then releases his semen into her nose bukakke style. This will cause a sinus like reaction.
Man, I gave your mom a mad sinus infection last night
3.
What I have right now, damnit.
"You fucker! I got a sinus infection from you!"
