Having an erection by surprise.
Tom:"Look at Mamita's booty"
Danny:"DAYUM"
Ben:"My dick flew faster than Apollo"
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!