Una oportunidad, una canción

In this context, 'usar a alguien de tapadera' means to exploit a third person to conceal one's own actions. The noun 'tapadera' is the key term; the verbal phrase is built around it.

Said with skepticism or mild sarcasm about someone whose good behavior is seen as calculated or insincere. The diminutive '-ito' intensifies the ironic tone.

An exclamation of indignation or disbelief, often used alone or at the end of a complaint. It comes from '¿habrá se visto cosa igual?' and is typical of older or theatrical speech registers in Argentine Spanish.

Literally 'to wrinkle', but used figuratively to mean losing nerve or caving in a tense situation. Common in Argentine informal speech.

A mildly insulting term for someone who acts foolishly or fails to understand something obvious. Used here in an exasperated but not seriously hostile way.

While an English equivalent exists ('add fuel to the fire'), the Argentine phrasing is worth noting because it appears naturally in argument contexts and the exact wording 'echarle leña al fuego' is the fixed Argentine form.

A popular Argentine refrán (proverb) used humorously or pointedly when someone leaves a place voluntarily but is expected to return. It signals that leaving on your own terms gives you the right to return on your own terms too.

Literally 'technical terms', but used here ironically to wave away an inconvenient truth or precise objection, as if to say 'that's just splitting hairs'. This ironic use is what makes it non-compositional in context.

Superlative formed with '-ísimo' on the adjective 'top' (borrowed from English). Used in informal speech to mean excellent quality or very fashionable. The borrowing plus superlative suffix is a very Argentine informal construction.