What does AIM oldbie mean?

AIM oldbie meaning in Urban Dictionary

Term generously placed on oneself which will make oneself feel better, and to mask the fact your head is really so far up your ass they can not use nor understand common logic; i.e., a person who ruins web roleplay by criticizing it, when the term "oldbie" originated on AIM via roleplay. Often self-applied condition, as almost no-one would call another an oldbie unless expected.