One way to hold it: a buster is whatever bursts the thing in front of it. Put a word before it and that word is the target — crime, a budget, a bunker — and the buster is what goes at it and breaks it open. The word aimed at a man works on the same volume: it is loud, it lands hard, and it refuses to use his name.
From the word’s history
The source records buster as originally a dialectal variant of burster, later influenced by bust + -er. It also notes that the compound pattern was especially prolific in three periods: the 1930s (the radio series Gang Busters), the 1940s (military slang), and the 1980s (the film Ghostbusters).
資料寫的是：buster 本來是 burster（把東西撐破的人）的方言變體，後來受到 bust 加 -er 的影響。它也提到這個複合字模式特別旺盛的三個時期：一九三〇年代的廣播劇 Gang Busters、一九四〇年代的軍中俚語，以及一九八〇年代的電影 Ghostbusters。
Wiktionary, "buster"
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