Chin-wiper is a slang term for a person who overuses their facial hair, causing it to irritate the skin beneath the chin. It is a term often used humorously to describe the appearance of someone with an overgrown or unkempt beard. Synonyms for chin-wiper include "neck-tickler," "face-broom," and "chin-tickler." These phrases imply that the facial hair is not well-maintained and can cause discomfort for the person wearing it. They are commonly used in the world of men's grooming and beard care, where it is important to keep the facial hair clean and trimmed to prevent irritation to the skin.