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
by vicious vaca April 29, 2011
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
by haleymadeethisss May 06, 2011
Nsi
Naval Science Intructor
MSgt. Borland is my NSI. He knows everything.He is a Marine. He is God.
by CPO November 27, 2003
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
by TextingNSI July 20, 2013
Not sure if serious
John: "What's Nsis?"
Bruce: Not sure if serious.
by Not sure if serious June 15, 2014
Nsi
Damn Brit.
Look at all the pos, especially Nsi.
by Fect February 06, 2003
No Sky In Sight - A kick as band In Port Angeles, WA, USA
NSIS is bad ass
by J3bus2010 October 05, 2009

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