If you are referring to a mother who is crazy, it would be: "madre loca".
However, if you are looking for the equivalent curse words, you will have to look elsewhere since it is against site policy to use profanities.
Bésame el trasero that's how u say you are crazy about me
loco
You can say "Estoy loco(a)".
You say, "tortuga loca."
¿Eres loco?
Estamos locos
No estoy loco
Me vuelves loco/a.
no demente, desquisiado, son others ways to say crazy.
You could say "Sombrero loco".
"piernas locas"
Ella está loca