In combat sport, specially in MMA, is a term used by a play-by-play announcer (e.g. Mike Goldberg). It refers to a ring strategy of a fighter who likes to throw consecutive rapid fire punches at an opponent to overwhelm them. This eventually leads to a knockout or a TKO because the opponent is unable to fight back due to the amount of punches being thrown at them.

When you eat dirt for the first time and leave your family to build a shack in the woods