What is Pateando Al Muerto?
1.
Kicking a dead body in Spanish.
It means that it's still trying to get a reaction to something, but it will be useless.
Y tu amigo sigue esperando volver con ella?
Si, pero ya ves, sigue pateando al muerto.
And, is your friend still hoping to get back with her?
Yes, but you see, he's kicking the dead body.