Top Definition
A person who 'hacks' access to a username which doesn't belong to him/her without the other person's informed consent and/or any rights exclusive to the original account owner (e.g. an encrypted password).

Where multiple (identical) usernames are allowed, especially on large image channels such as 4chan: a namefag who 'steals' the name of a celebrity or acts as a sockpuppet for an existing user on another website.
Jimmy Wales' Wikipedia account was stolen by a name thief today!
#username #thief #stolen #hack #hacked #namewaster
by Torchickens November 29, 2010
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