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An inventive insult combining 'gallina' (coward, chicken) with 'con sueño' (sleepy) to mock someone as both cowardly and sluggish. Not a fixed phrase from the broader lexicon but representative of the productive insult style in Latin American colloquial speech.

Used both literally and figuratively. Figuratively it means something is completely immune to damage, criticism, or failure. The figurative use is very common in everyday Latin American Spanish.

While literally 'diabolical', in colloquial Latin American Spanish it is often used with ironic admiration to call a cunning plan impressively devious, similar to English 'evil-genius'. Tone is key: it can be an actual condemnation or a playful compliment.