A phrase that originated from Danho's homonymous song, used quite often in Stan Twitter. It signifies a state of shock, surprise, or excitement caused by a song, event, video, or image.
Gigi: OMG, did you see that video?
Andrea: Of course, wig flew!
When you're exposed to someone serving such fierceness, body, or look that it's as if you "caught the spirit" so hard your wig is thrown from your head.
The first time I sawBeyoncé's Formation music video, my wig flew off.