ˌHappy ˈDays BrE AmE
a humorous US television programme, first shown in the 1970s and still very popular, about a group of ↑ teenager s in the 1950s who meet at Al’s Diner. The characters include Richie Cunningham and his sister Joanie, and Arthur Fonzarelli, known as the Fonz, who wears a black leather jacket and is always very ‘cool’ (==fashionable, confident, and relaxed.) .