You have a syntax error where it says
"Sin anestecia"
must say
"Sin anestesia".
Finally, jokes aside, you do not understand what you want to do well. If you want to form a sentence by randomly joining an element of each declared array, the way would be to generate 6 random values and ask for the position of these in the arrays above. And eye, your arrays have 4 elements, so you have to apply module 4 and not module 6.
#!/bin/bash
_0=(Mami Bebe Princesa Mami)
_1=("Yo quiero " "Yo puedo " "Yo vengo a " "Voy a ");
_2=(Encenderte Amarte Ligar Jugar);
_3=(Suave Lento Rapido Fuerte);
_4=("Hasta que salga el sol " "Toda la noche " "Hasta el amanecer " "Todo el dia ");
_5=("Sin anestesia " "Sin compromiso " "Feis to feis " "Sin Miedo ");
a=$(( $RANDOM % 4 ));
b=$(( $RANDOM % 4 ));
c=$(( $RANDOM % 4 ));
d=$(( $RANDOM % 4 ));
e=$(( $RANDOM % 4 ));
f=$(( $RANDOM % 4 ));
echo ${_0[a]} ${_1[b]} ${_2[c]} ${_3[d]} ${_4[e]} ${_5[f]};
Which would generate phrases like
Bebe Voy a Encenderte Lento Toda la Noche Sin compromiso
Bebe Yo puedo Amarte Fuerte Todo el dia Sin Miedo
Mami Yo puedo Encenderte Fuerte Todo el dia Feis to feis
But as I said before, it's not clear to me what you want to do. If you want your program to print the values of one of the 6 arrays in random order, the logic is different.
In other words, if you want your program to return the second array "I want" "I can" "I come to" ... given a parameter entered by console or randomly generated, what you're trying to do implicitly it is a nested associative list. And that in bash does not exist.