Chuffed to Bits
The act of masturbating with a high quality watch strapped around ones penis (you must have small wrists to accomplish this). During this high sexual performance a man will attempt to ejaculate or have sex with his hand bound to his penis by a high class watch. Perforation of the genitals is common during this activity bleeding, vomiting, and diarrhea are all common side effects

One may insert additional watches in their rectum to achieve a larger orgasm.
"Hey mate I was just Chuffed to Bits over that watch you let me borrow"

"Dude that is disgusting just keep the damn watch"

"O I M8 thank you bruva!"