nick - nickname or online name. Usage example: "funkyfunkypinkgala: hey, it's X, how do you like my new nick?" "nervouswombat: hey, I love it, babe". The selection of an imaginative, unique and accurately-descriptive nick will earn the admiration of others and is considered something of an art among dedicated chatters. To call yourself "Anonymous" is to invite ridicule.
N/A - not applicable/ no answer.
NC - no comment; I wish to make no comment or give no answer.
Newbie - novice user, person is not yet familiar with the internet or with computers. See also: virgin.
Noob - American abbreviation of newbie.
Nothing between the nipple and the knee - don't have sex in this chatroom. Public sex is not welcome in most public chatrooms. You wanna get down and get squinky in front to strangers? Go to google and search "chat" + "voyeur".
NP - no problem.
NSS - no shit, Sherlock.