Una revelación, una canción

Refers to the piggyback riding position, where one person carries another on their back. 'Caballito' is the diminutive of 'caballo' (horse); the image is of riding a little horse.

An English loanword fully absorbed into Argentine teen slang. Used dismissively to put someone down socially. More cutting than it might seem in English because of the contemptuous tone it carries in this register.

A fixed threatening expression indicating that the speaker intends to get back at someone for a perceived wrong. The 'las' is a fixed, non-referential pronoun in this idiom.