Old School term used in Oakland, California, USA, & other major American urban areas to describe and/or denote a demonstration of a remarkably fun-to-watch, quirky, but groovy, usually solo dance performance, typically used in deference to male demonstration of such dance.
"Dang! White boy was "giggin'"! Translation: The caucasion male performed a remarkably fun-to-watch and obviously fun- to-perform dance maneuver(s)!
Giggin does mean "to go stupid dumb on the dancefloor but but i talked to sources who worked with Mac dre and it when you start convulsing after poppin E tooo much and it starts to look like you're dancing.
Baby can you gig, you so crazy when you gig. Ugh she giggin'.
Mac Dre-US open