Slapping someone who's sunburned with an open hand full-force, so you leave a big handprint on their back or front.
Tom: I went to the beach yesterday, and I got soooo sunburned.
Mary: Ooh, let me see?
*Tom lifts up his shirt to show her his back*
Mary: Ooh, looks painful. D'ye want a bodyglove?
*Mary slaps his back full-force and runs away laughing*