Írsele la pinza

to lose it; **to lose it**; **to go nuts**; **to go crazy**; **to lose one's mind**; **to have a screw loose** (depending on the context)

Írsele la pinza means to lose it, to go crazy, to lose one's mind (temporarily) or to say or do something completely irrational.

It is usually humorous or exaggerated rather than a reference to genuine mental illness.

• says something absurd
• behaves irrationally
• completely overreacts
• loses self-control
• comes up with a ridiculous idea

It grew naturally out of everyday colloquial speech.

The pinza probably refers metaphorically to a mechanical part that holds something in place.

If that part comes loose, the whole mechanism stops functioning correctly.

This mechanical image evolved into a humorous way of describing someone's thoughts or behaviour suddenly "coming loose."

Modern speakers simply understand it as a colourful colloquial expression.

The expression is usually not offensive.

Very often it is said jokingly between friends:

¡Se te ha ido la pinza!

meaning:

You're talking nonsense!

or

Have you gone mad?

The tone depends heavily on context and familiarity.

Spanish has many colloquial expressions for behaving irrationally:

• Írsele la pinza → to lose it.
• Írsele la olla → to lose one's marbles.
• Estar como una cabra → to be crazy.
• Perder los papeles → to lose one's temper.

Among them, írsele la pinza is especially common because it usually describes a brief lapse of judgement rather than a person's normal character.

Do not translate the expression literally.

English speakers would never say:

His clip came loose.

Instead, use expressions such as:

• He lost it.
• She went crazy.
• You've gone nuts.
• He completely lost his mind. (usually exaggerated)

Choose the translation according to the degree of exaggeration.