Pranking someone by asking to take a picture and then playing "Peacock" by Katy Perry and dancing around the victim while taking a video. You do not tell them you are going to do it. Usually done at anime cons, comic cons ect.
Originated at AMA 2011 (Anime Mid Atlantic 2011)
Pranksters: Hi, can we take a picture of you?
Victim: Um, sure.
*they pose, cam starts video recording*
Pranksters: One, two, three...
*Peacock plays and they start dancing*
*Victim will either start dancing, run away, freeze up or crack up*
Friend: Hey, whats up?
Victim: I got Peacockd....