The term used to define when something is 'very good', or when something was a positive experience.
Originated in Sydney's upper class private schools on the North Shore, amongst its senior yeargroups, before branching out towards the Northern Beaches and the Western Suburbs, as well as the Shire.
Mark's 18th was heaps A.
"Did you hear about Paul throwing his shoes at Mr Smith?"
"Holy shit, that's heaps A."
"I went hunting the other day, shot down two ducks, and I was like, "A."