A term used when a sexually inexperienced boy is making out with a blonde chick. While is is laying on top of her making out, he comes in his jeans, and the extra seeps through his jeans and the girl realizes. He them puts a pillow over his crotch out of embarassment and doesn't change pants until the girl leaves the scene.
Girl- Ewwww I was making out with Johnny last night and 2 minutes in he was Dannying on me. Talk about premature!