Hot-Blooded (3.5e Feat)
From D&D Wiki
Hot-Blooded [General, Fighter]
With your passion and fury, you sacrifice accuracy (and the chance at a critical hit) to roll extra damage dice!
Benefit: When you make a Power Attack at a penalty of -5 to your attack roll or greater, you may choose to roll your weapon's damage dice a number of times equal to the weapon's critical multiplier, adding the extra damage to the total. If you roll a critical threat, you automatically fail the critical confirmation roll, but the attack is otherwise resolved normally. You may use this ability only once per encounter.
Special: A fighter may select this feat as one of his fighter bonus feats.