Seso (en. Brain)

/ˈseso/

Slang Meanings

Used in some regions to refer to someone foolish.
That guy is a fool; he doesn't understand anything.
Ese tipo es un seso, no entiende nada.
Sometimes used in the context of good intelligence.
That girl is brilliant; she always has the best ideas.
Esa chica es un seso, siempre tiene las mejores ideas.