The act of taking a really drunk girl (or guy), putting them in your passenger seat, then driving around really recklessly to get them sick. When they stick their head out the window to throw up, you roll up the window to trap their head out (but dont cut off air), pull down their pants, and fuck their ass silly. The vomiting will cause tension and contractions in the body of the trapped person, clenching the muscles of the ass around your dick, causing an orgasmic sensation.