no sabe lo que dice

doesn't know what they're talking about

→ no
phrase Rare #26,453
doesn't know what they're talking about Used to say that someone does not understand or is saying things without knowing what they mean. The subject can be understood from context.
SP: No le hagas caso; no sabe lo que dice.
EN: Don't pay attention to him; he doesn't know what he's talking about.

Es un chico, no sabe lo que dice.

He's a kid, he doesn't know what he's saying.

— Adiós, muchachos (1987)

No sabe lo que dice.

He doesn't know what he's saying.

— Love Actually (2003)

Escucha, no sabe lo que dice.

Listen, he doesn't know what he's saying.

Escucha, él no sabe lo que dice.

Listen, he doesn't know what he's talking about.

Mi cliente no sabe lo que dice.

My client doesn't know what it says.

— Anora (2024)

La pobre no sabe lo que dice.

The poor thing doesn’t know what she’s saying.

— Mujeres al borde de un ataque de nervios (1988)

La gente no sabe lo que dice.

People don't know what they're saying.

— El bueno, el feo y el malo (1966)

Bebió demasiado, no sabe lo que dice.

He drank too much; he doesn't know what he's saying.

Quien dice estas cosas no sabe lo que dice.

Whoever says these things doesn’t know what they’re talking about.