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Te falta una patata para el kilo

You are very stupid

ES
Example

Tío, ¿otra vez has metido las llaves en el congelador? Te falta una patata para el kilo.

When to use it

Your friend forgets their phone inside the fridge for the third time and you laugh and drop this line.

What it means

Literally, it means "you're missing one potato to make a kilo," like a bag that's slightly short of the full weight.
In practice, it means someone is not very bright, a bit slow, or "missing a screw." It's usually teasing rather than truly vicious, though it can still offend if you say it seriously. It's part of a family of Spanish jokes like "le falta un tornillo" or "no le llega el agua al tanque," all implying someone is not fully "complete" mentally.

Don't confuse it with

"Te falta una patata para el kilo" does not mean you're a scrub/ too poor for this, you're such a jerk, you are too impatient and definitely not ready. It specifically means "You are very stupid".

Hear It in Action

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