When you are playing music at an open mic night and a complete stranger jumps on stage and starts playing with you without asking.

Highly annoying, especially if said stranger isn't nearly as good as they think they are.

A portmanteau word from "jam" and "ambush." Past tense "jambushed."
Roommate: Yo, how was open mic tonight?

Bleeding-heart songwriter: Lame. Got jambushed by this drunk harmonica player. Just leaped up without saying anything and started doing terrible, terrible things to my song.

Roommate: Sucks, dude.
by whomakesyourmoney July 30, 2010
Get the jambush mug.
when you got to a concert expecting a certain type of music and end up watching a jam band.
Dude, we went to go see System Of A Down and the opening band sounded like Phish. We got jambushed.
by chillantro March 21, 2010
Get the jambush mug.
When one unwittingly opens a Myspace page and is surprised by the music loaded onto the profile. This usually occurs when the subject's speakers are at an above normal volume, but wasn't previously listening to something. Often a furious and spastic search ensues to close the offending page.

In some cases, a Myspace profile will have more than one song loaded onto it. The resulting sound can be described as no less than an aural car accident.
I opened her myspace up and went back to finish the e-mail I was writing, only to have a good 20 seconds of Fall Out Boy at an earsplitting volume.

Cracker got Jambushed!
by zak Stevens September 16, 2007
Get the jambushed mug.
When someone walks into a room full of jewish people and doesn't fit.
"Dont go in there cathy, its a Jambush.".

"Thanks dave, i owe you one"
by 10SpeedTed November 26, 2011
Get the Jambush mug.