تعریف و معنای "[give] {sb} a melvin"

What is the origin of the idiom "give someone a melvin" and when to use it?

The origin of the idiom "give someone a melvin" is not well-documented, and its specific origins are unclear. It likely emerged as a playful or mischievous act among friends or peers. The name "melvin" itself is believed to have originated as a humorous name given to the prank. It is often employed during moments of camaraderie, joking around, or playful teasing.