A slang term substituted in for banning, or 'exiling' somebody from a chat channel. Also can be removed from other things, such as as a board, forum, team, etc; most often online.
Origins come from Starcraft where moderators were depicted with a hammer or maul as an Icon.
"3l1t3_PwN3r has left the channel."
Lol, that guy just got hit by the ban hammer!
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