Master Bull Rush (3.5e Feat)
From D&D Wiki
 Master Bull Rush [General]
You are an expert at delivering a Bull Rush, so much so that you can avoid some of the standard penalties.
Benefit: You gain a +2 bonus on the opposed Strength check for a Bull Rush and an extra 5 ft. on the distance you can push your opponent. When moving with an opponent you do not suffer attacks of opportunity, but your opponent still does.
Normal: You provoke attacks of opportunity as you move with an opponent and can only move them 5 ft. + 5 ft. for every 5 points you beat their Strength check.