To see others jigging indicates that you are too easy (or careless) regarding money and are in danger of having your generosity abused.
Conserve your funds for the time being. [1]
To see negroes dancing a jig, foolish worries will offset pleasure.
To see your sweetheart dancing a jig, your companion will be possessed with a merry and hopeful disposition.
To see ballet girls dancing a jig, you will engage in undignified amusements and follow low desires. [2]
If you watch someone else dancing a jig, you will fall in love. [4]