What is the meaning of Moonshine?

The light of the moon.

High-proof alcohol (especially whiskey) that is often, but not always, produced illegally.

Nonsense.

A branch of pure mathematics relating the Monster group to an invariant of elliptic functions.

A spiced dish of eggs and fried onions.

A month.

To make homemade (especially, illicit) alcohol, especially distilled spirits.

To make (an ingredient) into such a drink.

moonshine (Appalachian home-made liquor)

Source: wiktionary.org