Any one of a number of people, who follow one or more bands around for the soul purpose of 'socializing' at the band's shows, rather than actually listening and appreciating the music being played. The 'socializing' however, is negative: gossiping, slandering, causing drama, starting rumors, crying, fighting, looking to get laid, STALK, looking to break up with someone or cause a break up, bitching, pissing, moaning, or being a general PAIN IN THE ASS to anyone who is there, trying to hear the GOD DAMN MUSIC! See idiot, asshat, hag, bitch, asshole, groupie, obsessed, stalker, alcoholic, and mentally ill.
The whole night will suck because all the clannies will be there.
Someone who is in the same clan as you are, e.g. in an online role-playing game.
My clannies and I did an awesome raid last night.
I babysit a clannie's account because they are on holiday right now.