Season 5 · Episode 7
The Simpsons
Springfield emulates Bart after he's praised by a self-help guru.

A fixed catchphrase of defiance or dismissal. The literal words (eat my underwear) give no hint of the social function, which is pure provocation directed at an authority figure or rival.
A fixed term from the self-help and pop-psychology world. Used in this episode as both a genuine therapeutic concept and satirical target. The phrase is non-compositional in practice: knowing 'niño' and 'interior' does not tell you it refers to the psychological concept of unresolved childhood emotions.
From the idiom 'meter la pata', meaning to make a blunder or serious mistake. The image of sticking a leg/foot into something conveys no literal message about the actual meaning.
Used throughout the episode as a self-help mantra. While the individual words are transparent, the phrase functions as a fixed cultural slogan within the episode's satirical framing, and understanding it as a catchphrase rather than ordinary advice is key to the comedy.
An exclamation associated with youth and skateboard culture in the Latin American Spanish dub of this show, used to express enthusiasm or a rush of adrenaline. Not a native Spanish word; its meaning is entirely contextual.
A fixed temporal expression meaning continuously or at any hour of the day. Compositionally it could suggest 'at every hour', but in natural use it means 'nonstop' or 'all the time', which is a degree of idiomatization worth noting.