Tortue folle.
Your mother is a crazy turtle.
Bésame el trasero that's how u say you are crazy about me
loco
You can say "Estoy loco(a)".
¿Eres loco?
Me vuelves loco/a.
No estoy loco
Estamos locos
You would say las tortugas.
no demente, desquisiado, son others ways to say crazy.
You could say "Sombrero loco".