SpanishTener los huevos de corbataTo be filled with fear - When your balls retract so much (because of fear) that they reach your neck and you can wear them as a tie.

The [Collins dictionary](https://www.collinsdictionary.com/dictionary/spanish-english/se-me-pusieron-los-huevos-de-corbata) gives a curious translation, but I guess the vulgar connotations are lost in it.