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1.
Not Sure If Sarcasm. Used when you're not clever enough to know if someone is being sarcastic or not, but you're modest enough to admit it.
A: omg you're awesome. I love u 4ever <33333
B: nsis
A: ... definitely sarcasm
von vicious vaca 29. April 2011
 
2.
NSI
No Sarcasm Intended
used when you make a smart Alec remark when you dont mean to be a smart ass.
That is so sad. i think i wanna cry.

Hm. Smart Ass.

Chill man, NSI
von haleymadeethisss 6. Mai 2011
 
3.
Nsi
Naval Science Intructor
MSgt. Borland is my NSI. He knows everything.He is a Marine. He is God.
von CPO 27. November 2003
 
4.
NSI
No Sarcasm Intended;

When you're texting and you say something that isn't meant to be interpreted sarcastically.
Brett: Dude, I got 1st place in the race!
Bruce: Good for you!
Brett: ...
Bruce: NSI
von TextingNSI 20. Juli 2013
 
5.
Not sure if serious
John: "What's Nsis?"
Bruce: Not sure if serious.
von Not sure if serious 15. Juni 2014
 
6.
Nsi
Damn Brit.
Look at all the pos, especially Nsi.
von Fect 6. Februar 2003
 
7.
No Sky In Sight - A kick as band In Port Angeles, WA, USA
NSIS is bad ass
von J3bus2010 5. Oktober 2009