the act of talking someone out of taking the last of something; then proceeding to take that item for yourself
Blake: Dude, you can't take that Coke it's his last one!
Taylor: Ooh, yeah man your right that would be kinda fucked up, I'll put it back
Blake: (Grabs Coke that was just put back and starts chugging it)
Taylor: Woah dude, WHAT A DOUCHE BAG MOVE!!!!