A dressy joint is a type of establishment that requires its patrons to dress in formal attire. The term 'dressy joint' can be used to describe a variety of places, such as a high-end restaurant, a nightclub, or a casino. The crossword solution for the term 'dressy joint' is SEAM, which is an acronym for 'Smart Evening Attire Mandatory'. This acronym is often used to indicate that a certain establishment requires its patrons to dress in formal attire.