the act of heating up a cart with a lighter, dropping into a sock once evenly heated and using centrifugal force to concentrate the hot oil/wax to one area. the origin comes from the tv show iCarly where the character Sam Puckett (played by Jeanette McCurdey) takes a stick of butter from Carly's fridge and puts it into a sock to make a makeshift mid-ranged weapon, swinging it to hit people.
person A: aw man my cart is nearly empty
person B: have you tried buttersocking it yet?