We found one dictionary that defines the word bumper bullets:

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1. bumper bullets: Wiktionary

▸ Words similar to bumper bullets ▸ Usage examples for bumper bullets ▸ Idioms related to bumper bullets ▸ Wikipedia articles (New!) ▸ Words that often appear near bumper bullets ▸ Rhymes of bumper bullets ▸ Invented words related to bumper bullets