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Sinuses are in your face. They are near your cheekbones, nose, eyes and forehead. If you don’t blow your nose and just suck snot in, your sinuses will get clogged with snot.
Logan: Hey Bro I can’t come to see Callie and Stacey , I’m sick.
Lino: Why are you sick bro, what did you do?
Logan: My sinuses are clogged.
Lino: Of course they are. Damn right they are.
sinuses by Patrisha Lembert February 2, 2018
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sinus friction 

Slang for "nose picking", funny because it sounds like "science fiction".
PETER: So, Bobby, what caused your car accident?

BOBBY: Well, don't tell anyone, but ... sinus friction.
sinus friction by Mike Bozdog June 19, 2006
To feel congested, have a 'stuffy nose', etc.
It's spring time and everything is in bloom. I'm feeling rather sinusy, too.
Sinusy by Seerah123 September 6, 2009

Sinusoidal syndrome 

A person whose happiness if measured on a happy o' meter would behave sinusoidally (the graph would look like a sine wave).
If Fred's happiness varies sinusoidally because he has sinusoidal syndrome and he is completely sad (0) at time 5.2 and goes to completely happy (10) at time 12.8 what is the trigonometric function for his mood?

The math teacher went off on another tangent and began rambling about people whose moods vary sinusoidally because of their having sinusoidal syndrome.
Sinusoidal syndrome by bob11d6 June 17, 2010

extracting the sinus 


Means bringing pressure too the body or phermones,too become sick
also too take away sickness's,also saying very insolent things..

extracting the sinus
(E.T.S)
You should be only extracting the sinus if you know what you are doing...

sinus sauce 

Euphemism used to describe cocaine in polite company.
'I mean I was pretty drunk, but I got ahold of that sinus sauce and straightened out right quick'
sinus sauce by Thief Ledger October 5, 2018

sinusitis 

That stupid annoying freaking crap that prevents natural breathing through the nose. Colds and allergies often cause this.
I hate having this crap called sinusitis. If it lasts for more than three months, then it's called chronic sinusitis, with surgery being the only way to resolve it.
sinusitis by The Real Driller August 20, 2023