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1.
Someone who joins a chatroom and uses the same name or a name similar to someone who is already in the room participating in conversation.

Namesteals usually involve said person attempting to proclaim stupidity or homosexuality.
--Kos has joined the chat.

****Conversation****

--guest###### has joined the chat.
--guest###### is now known as Kos

(Namesteal) Kos: I'm gay and proud so don't say a word.
(Real) Kos: Uhh... fuck off, namesteal.
by Packless May 28, 2007