Tumbling Feint( Player's Handbook II, p. 84)
[Fighter Bonus Feat, General]
When you move near an opponent, your acrobatic maneuvers leave him confused and unable to properly defend himself.
As a swift action at the start of your turn, you designate a single opponent as the target of this feat. If you successfully use your Tumble skill to avoid provoking an attack of opportunity from that opponent, you gain a +5 bonus on your next Bluff check to feint against him. You must use this benefit on or before your next turn. For example, Lidda designates a nearby ogre as the target of this feat. She tumbles into the ogre's threatened area and continues to tumble past the creature, moving to a square from which she plans to make a melee attack against the ogre. Lidda succeeds on her Tumble check to avoid provoking an attack of opportunity from the ogre, and she moves into her destination square. She can now use a standard action to feint the ogre, applying the benefit of this feat on her Bluff check, or she can take any other sort of standard action, including making a normal melee attack against the ogre. If she chooses not to feint immediately, she can wait until her next turn and still gain this feat's benefit
A fighter can select Tumbling Feint as one of his fighter bonus feats.