The infamous stalker of All Time Low's lead singer, Alex Gaskarth. She bought his address online, and went to his house, hid in his bushes, and knocked on his door and asked for pictures. All Time Low fans use 'Ali King' to refer to a stalker. It can also be used as a verb (Ali Kinging).
Did you see that Ali King on the news? She was Ali Kinging that celebrity! he went to his house and hid in his bushes.