Top Definition
The act of sending a message in the wrong IM window (or tab) so that your message gets sent to the wrong person.
Dude1999: "You're so hot."
Mom1234: "Wat"
Dude1999: "Oh crap I meant to send that to my girlfriend"

This is a classic example of dysfenestration.
by tclark101 July 13, 2011
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