What is purple nurple meaning?

Purple nurple is a slang term for a prank in which someone squeezes or twists another person's nipple causing a brief moment of pain. The term is thought to have originated in the 1970s and gained popularity in the 1980s and 1990s. It is typically considered a juvenile or immature prank and is often used among friends as a form of playful teasing or hazing. However, it can also be considered a form of assault if done without the other person's consent. The term "purple nurple" is derived from the sensation of the nipple turning purple due to the constriction caused by the prank.