(Otherwise known as "Burger King-ing it")
After a night out when you and your friends are looking over pictures taken at the club, party, dinner, and you happen to find the same (random) person in the background in each and every photo- whether it be unintentional or not.
May include standing and staring in your general direction, the pose very much alike to the Burger King in his commercials.
Letty: "Isn't this same chick from the last four pictures? What the eff?"
Betse: "Ha, she was BK'ing it last night."