Elk

From Wolfekipedia

tr. v. elked, elking, elks To mimic the handle of forum member in such a way that one's identity will be mistaken for that of the forum member in question, usually for the purpose of creating mischief or comedy.

Usage: Do you know anything about that guy who's using my handle with a _ added to it? I'm not sure if I'm being elked or not.

A normally youthful member of a community who is frequently an example of 'what not to do', yet still beloved by his adopted family.