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

Damn Brit.

Look at all the pos, especially Nsi.

by Fect February 06, 2003

NSI

The best group of pokemon players the world has ever seen. Lead by their fearless leader Heck.

The members of the NSI often eat beef.

by H E C K August 10, 2018

nsis

Not sure if serious

John: "What's Nsis?"
Bruce: Not sure if serious.

by Not sure if serious June 15, 2014

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 31, 2011

NSIS

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 May 22, 2011

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 August 29, 2013