Belter/ˈbeltər/ Definition 1 of 3Pro Tip 1/3British slang Predominantly British slang; might not be understood globally. I saw a movie last night. It was a real belter. Pro Tip 2/3Positive excitement Used to express excitement or approval about something. You got the job? That's an absolute belter! Pro Tip 3/3Informal praise Informal way to praise a person or thing; not used in formal context. Her performance in the play was a belter.