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The weird, unexplained discontinuation of an IM conversation. In many cases, the person who, for whatever reason stopped talking to you, is still signed on. Often occurs in intense parts of conversations.
Over Instant messaging:
Jill: I just got back from dinner with my boyfriend.
Heather: Did he propose?
--------------10 min later-----------------------------------------
Heather: Don't pull an IMunot with me! I see that you're still online!
by Dr Lina P August 14, 2009
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