Resembling or having the qualities of a bang or bangs; making a loud sound, or tending to make banging noises.
From 'bang' plus the adjectival suffix -y, which is commonly used in English to turn nouns into descriptive adjectives.
The suffix '-y' is one of English's most productive and creative tools—speakers can add it to almost any noun and be understood, which is why 'bangy,' 'jumpy,' and 'bumpy' all instantly make sense!
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