Ejection from an area or establishment, classically via being picked up by the seat of your pants and the back of your shirt. The term has come to include most forms or violent rejection. Presumably this came from the ejecting of panhandlers from business establishments.
The act of a bar bouncer, security guard, or some authority figure forcibly removing a person (the "bum") from a location by twisting said person's arm behind his back and pushing the forearm skyward while rapidly pushing (rushing) the body toward an exit.
To attack someone or something by wildly charging them full force with no sort of tact or skill other than one's own momentum and possibly the backs and sides of their fists as they randomly flail them out of rage, but certainly consisting of no precisely swung blows.
To run up on someone usually with multiple people and proceed to assault them. This method is generally a surprise to the victim and can result in their belongings being taken and them being stomped.