A person with less knowledge who attempts to appear more intelligent by providing a solution that has already been established with the intent to take credit.
Jacob flagged down his supervisor to discuss a problem and solution that he had overheard his coworker Cece describing. He regurgitated the situation which left Cece feeling completely underminded as she knew all the intricacies and Jacob had clearly taken credit for her solution.
The action of female grasping to line up the penis for proper angle of penetration prior to intercourse; woman on bottom. Most common when a guy (freehanded) rubs the head of his penis around the pussy lips and doesn't insert; frustrated the female will grasp the dick with a underhand grip and slid it in. The man will immediately feel gratified as the woman was unable to hold out any longer and executed penetration. Excellence is measured when a woman who plays extremely hard to get gives an "underhand slider".
Matt: Last night I was messing around with Tiffany and to my surprise she gave me an "underhand slider"! I was teasing the shit out of her and making her quiver...she couldn't take it and underhand slid it in.
Zak: Those are the best.....Kristen holds out and acts like she doesn't want it but I get an "underhanded slider" nightly.
Jimmy: I get underhanded by Sam all the time....she love the dick!
All: HAHAHA