1. a type of firework that makes a loud hissing sound.
2. a whirling toy that makes a whizzing noise.
4. Australian. a police informer.
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Origin: 1520–30; earlier fisgig, equivalent to fis (late Middle English fise term of abuse; akin to Old Norse fīsa to break wind; cf. fizzle) + gig (Middle English gigge girl; see giggle)
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