A term commonly use on social networking and message boards during disagreements to announce that the speaker is deriving amusement from the altercation. The term also indicates that the speaker is not otherwise going to participate in the argument. It is used by itself as an interjection or as part of a phrase that indicates the speaker is going to sit back and enjoy the show.
Verb: To bounce around unnecessarily-in turns or bumps-in the passenger seat of a car. React dramatically to an insignificant turn or bump in a car. To jiggle about dramatically as to distract a driver to be obnoxious then act like nothing happened.
MEL (driver): *gently takes a left turn*
BJORN (passenger): *flails and rolls violently in the seat*
MEL: What the hell, dude?
MEL: Quit popcorning!