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1.
Accidentally typing a message in the wrong window on the computer - eg using instant messenger chat, IRC, or even a word processor.

Shortened form of "sent to the wrong window".
davis> Yeah, she's awesome hey..
tormsen> Talked to her recently?
carlo> /download LESBIAN_PORN -all
davis> ...
carlo> oops. miswindow.
by Tajjster July 01, 2005