A colloquial term used in some Latin American countries to refer to a person who is madly in love. It's often used to describe someone who is so smitten, they're practically at the feet of the person they're in love with.
Examples
- Spanish: Desde que conoció a Maria, Juan está apiernado, no puede dejar de pensar en ella.
- English: Since he met Maria, Juan is head over heels, he can't stop thinking about her.