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Side Banging is the emo verison of head banging where instead of violently shaking the head up and down, the emo swings his head back and forth, looking as if he's saying no. Under no condition is side banging ever acceptable.
Side Banging is the queer cousin to Head Banging.

That loser thinks he's big shit cause he side bangs, but he's just a wannabe.

Side banging is the emo verison of heavy metal headbanging
by Trollkodze Makes Me Laugh March 21, 2010
Having an affair
John has been staying late at work every night, should I be worried.

Yeah he is totally side banging his secretary
by passion84photography June 24, 2011