The French Dip is the female equivalent to 'teabagging' someone. The same action is executed in the female teabag as in the male teabag. However with the French Dip, the idea is that the female is dipping the 'roast beef' upon the target person. More common in online shooters and MMO games, the 'French Dip' is known more commonly as 'face sitting' in sexual encounters and other real life situations.
Person 1: "That bitch just killed me."
Person 2: "Where is she?"
Person 1: "Great, now she's giving me the French Dip."