Definitions by Derf King

NISI 

Now I've Seen It

Person 1 "Look at that guy juggling chainsaws on fire wearing a thong on a unicycle!"

Person 2 "NISI"

NISI by Derf King October 26, 2011

NIHI 

Now I Heard It

Person 1 "I just added the term NISI, to urban dictionary!"

Person 2 "NIHI"

NIHI by Derf King October 26, 2011