Hella. Originated from the streets of San Francisco in the Hunters Point neighborhood. It is commonly used in place of "really" or "very" when describing something.
When you are doing a chick doggy style. You go in like your going to grab her tits and abruptly swing your arms outwards so she falls on her face. Now start pushing her around the room into coffe tables, lamps, etc. making bulldozing sounds.