What is the meaning of Fizgig?

A flirtatious, coquettish girl, inclined to gad or gallivant about; a gig, a giglot, a jillflirt.

Something frivolous or trivial; a gewgaw, a trinket.

To roam around in a frivolous manner; to gad about, to gallivant.

A small squib-like firework that explodes with a fizzing or hissing noise.

A spear with a barb on the end of it, used for catching fish, frogs, or other small animals; a type of harpoon.

A police informer, a stool pigeon, someone employed by police to entrap someone else or provoke them to commit a crime.

To act as a police informer or agent provocateur.

common ragwort (Jacobaea vulgaris, syn. Senecio jacobaea).

Source: wiktionary.org