Green’s Dictionary of Slang

ball-breaking adj.

also ball-busting
[ball-breaker n./ball-buster n. in all senses]
(orig. US)

1. [1940s+] acting as a hard taskmaster or dominating woman.

2. [1960s-80s] physically demanding, exhausting.

3. [1970s] very irritating.

4. aggressive, cruel.