Spanish (Castilian) · B2 humor

Ser la leche

Literally: "To be the milk"

To be amazing (or terrible, depending on context)

Example

¡Este concierto es la leche! Me encanta.

This concert is amazing! I love it.

Pip says

This one’s a chameleon—it can mean awesome or awful, so listen for the tone like a berry tasting the wind!

What does this phrase mean?