A condom or prophylactic device (Australian and New Zealand slang term).
Australian/New Zealand slang, possibly derived from 'Frank Sinatra' through rhyming slang (Frank Sinatra → 'franger'), though the exact etymology is debated among linguists.
Slang terms for contraception are fascinating because they reveal what cultures find embarrassing to say directly—the fact that 'franger' hides behind a famous singer's name shows how humor and euphemism protect us from awkwardness.
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