You've incorporated dirty fighting into all of your attacks.
Prerequisites
Brawl, Street Fighter, base attack bonus +6.
Benefit
Each time you make a successful melee attack with an unarmed strike or a light weapon, you deal an extra 1d4 points of damage with that attack. This stacks with the bonus from Street Fighter, meaning that one attack per round deals an additional 2d4 extra damage while the rest deal 1d4 extra damage.