What is Grey Lady?
1.
a grey ghost of a lady that every primary (at least in my area) had. Usually found in the lads or girls toilets (depending on if you're a lad or a girl). Appears at night or when someone says "grey lady" three times and switches the light off. No primary school kid dared try it and if they did they left before she could appear (apparently). Varying stories of her death and stories of my mates' mate's older brother saw her as a kid.
Boy 1: hey let's make the Grey Lady appear
Boy 2: no! That's just stupid! She'll take her revenge for being jilted at the altar!
(it was common to say she was a vengeful spirit who was jilted by her husband or something similar)
See