You've incorporated dirty fighting into all of your attacks.
Prerequisites
Improved Unarmed Strike, 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 damage is added to the base weapon damage and is multiplied on a critical hit.
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.