Liberal protesters, often anti-war, anti-Bush, anti-capitalism, etc. They often get the police involved due to destructive behavior, and the police sometimes use a
gun that shoots beanbags, as a crowd control weapon.
The term is a fitting rebuttal to liberals who call conservative protesters "teabaggers" for attending anti-big government "
tea parties".
"Did you
see those beanbaggers at the G20 Summit? What a
bunch of animals".
"Conservatives are peaceful "teabaggers" but
liberal beanbaggers behave like animals.