Definitions by DaRKeniNG

NI 

NI = Not invited

A person that Butts into a conversation when he/she is not invited... thus being a NI

Person 1 "Hey how you doin?"
Person 2 "Hey man im ok so hows... stuff"
Random person "Hey guys"
Person 1&2 "Shut up u NI"

NI by DaRKeniNG June 22, 2006