Mr. Lisa Goes to Washington

Literally means scrap metal, but in everyday speech it labels anything cheap, worthless, or low-quality, including food, mail, or merchandise.

Literally a polite request, but used ironically to express disbelief or exasperated dismissal. Tone and context flip the meaning entirely.

A fixed idiomatic phrase referring to someone who reads obsessively. The individual words (rat, library) give no clue to this meaning.

Fixed compound used for unsolicited promotional mail or spam. Combines chatarra (junk/scrap) with correo (mail) in a way that is not immediately obvious to learners.