To instant message a friend, co-worker or family member immediately after they become available online. The term applies most aptly to those who do so consistently and perpetuate lengthy and pointless instant messaging sessions.
Dick: "Did you get your fourth-quarter financials finished?"
Jane: "No, because my college roommate IMbushed me as soon as I booted up and I couldn't get rid of her"
by Jake Valentine December 20, 2007
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/noun/
A planned attack, committed by two or more internet-savvy people, which uses instant message to assault, interrogate, or incriminate a third party.
My attempt to date two boys at once fell apart when they IMbushed me, demanding I fess up.
by Maureen O'Connor July 11, 2004
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adj. The overwhelmed feeling you get, when you're suddenly instant messaged by several people all at the same time.

Unexpectedly being IMed by lots of people all at once, and feeling annoyed because how you have to reply to five people instead of just one.
"I'm feeling pretty imbushed tonight... too many IMs!"
by Alethea P March 3, 2009
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an IM ambush; the surprise attack of a person messaging you immediately after you sign on to a messaging service viz., AIM, Facebook Chat.
I become very wary when I sign on to facebook because I'm scared of an IMbush; they are very surpising and often awkward.
by yournamehere192 October 24, 2009
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