Ur mom gay is a (homophobic but not in a bad way) insult used by 13-year-olds who think they are funny.
Pwerson 1: Muy mom got coffee.
Person 2: HaHa Ur mom gay
Person 1: Actual;y, Susan is Bi and Ella is pansexual. Nice try tho.
Person 2: Ok but they are in a WLW relationship, so it's still very fruity.