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1.
To tell the world what they should be doing and what you think by plastering your car with bumper stickers to that effect.



Jim: That "Keep Tahoe Blue" sticker is really making me wonder how to keep Tahoe blue.
Mike: Yeah, Berkeley is full of bumper sticker activism. Too bad the sticker's on a Ford Expedition, since keeping Tahoe blue involves reducing emissions.
by wendyrocks November 06, 2006
 
2.
As said by the Rockman in “The Point”; “A Point in every direction is the same as No Point at all”
Doris: look at all those bumper stickers!
Dad: we all know what that says about bumper sticker activism!
by pendraggon November 11, 2008