When semen (cum) is ejaculated into a woman's hair and on her forehead. This can appear to be in the shape of a tiara. Similar to a pearl necklace but at the hairline of the hair /forehead rather than on the neck/chest.
Molly was scared to taste Big John's cum, so she pulled him out of her mouth at the last minute and let him give her a pearl tiara.
de Roger Boi 16 August 2007