Adjective
Resembling or suggesting a jig.
(slang) Crazy.
He's gone completely jiggy.
(slang) Jittery, fidgety, restless, excited.
(slang) Extravagant, wonderful, excellent, enjoyable, exciting, stylish, cool, successful.
(slang) Having fun, enjoying oneself totally; losing one's inhibitions, especially when dancing or performing to music.
Source: en.wiktionary.org