Banned Sandwich is when one being leeches files from another and fails to share files on their behalf resulting in the sharer banning the leecher.

Another common example is if one encounters a troll this can result in a Ban Sandwich
by Labman December 19, 2009
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to apply a ban to a user from using an IRC chatroom. Only ops can ban users.
stfu before i give you a ban sandwich
by Nobuyuki February 19, 2004
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