A person who ruins your buzz on a night out (wether it be chemcially assisted or not). A uni-sex term for someone who seems to demand attention but who doesnt return anything to the group dynamic.
Guy 1: Mate anytime I hear her speaking I immediately stop listening. She really is Buzz Killington tonight
Guy2: she is such a Cled!
Guy 1: Total Cled! I dont know if I am longed out or pranged out but I know she is the originator of this fun void we find ourselves in.