you can say it in 3 different ways:
1) Nina loca .
2) nena loca.
3) chica loca.
The best translation is "Chicas locas" (see the plural) or "Chicas alocadas". By the way, thw word "Nina" doesn't exist in Spanish, we write it niña.
Consigamos loco.
deja lo consiguen en
vamos a emborracharnos!
You say woohhoo lets get crazy
Bésame el trasero that's how u say you are crazy about me
loco
You can say "Estoy loco(a)".
Vamos a tener.
nomas
¿Eres loco?
Me vuelves loco/a.
No estoy loco
Estamos locos
You say, "tortuga loca."
there is not an exact translation for it; it depends on what you want to say. ex: lets go eat - vamos a comer lets jump- saltemos ( as you can see in this case there is no word used instead of lets, but it is understood as lets jump)