/fiz"gig'/ , n.
1. a type of firework that makes a loud hissing sound.
2. a whirling toy that makes a whizzing noise.
3. fishgig.
4. Australian. a police informer.
[ 1520-30; earlier fisgig, equiv. to fis (late ME fise term of abuse; akin to ON fisa to break wind; cf. FIZZLE) + gig (ME gigge girl; see GIGGLE) ]