Start with the sound: one loud, flat BANG, close enough that your shoulders jump. Add -er to bang and you get a name for whatever made it — the thing that bangs. That is the whole machine behind this word. Sometimes the bang is real and in the air: a , a tired engine, a sausage splitting in a hot pan. Sometimes the bang is what a thing does to you rather than to your ears: a song that lands like a punch. The word never describes something quiet, careful or gentle, in any of its uses.
From the word’s history
bang + -er, the thing that bangs. Wiktionary adds the sausage story: the sausages had so much water in them and such tight skins that they could burst in the pan unless you pricked them first.
banger 就是 bang（砰）加上 -er，字面是「會砰的那個東西」。Wiktionary 另外記了香腸的由來：早期的香腸水分多、外皮又密，下鍋不先戳洞就會爆開。所以連食物也被那一聲命名了。
Wiktionary entry for banger, etymology_text supplied in packet (source_ref kaikki:3f6f69a190036ae4:689163234:28436)
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