1 definition by yournamehere192

Top Definition
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 23, 2009

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.