descocarse

A somewhat dated, moralizing word meaning to act in a bold, shameless, or flirtatiously immodest way — usually said (often disapprovingly, historically almost always of women) about behavior seen as scandalously forward. The related adjective descocado/a is more common than the verb itself.

• Según la abuela, la joven se descocaba demasiado en las fiestas. — According to grandma, the young woman acted too boldly at parties.
• La crítica de la época consideraba descocada su forma de vestir. — Critics of the time considered her way of dressing shamelessly bold.
• Es un verbo con un tono anticuado y juzgador. — It's a verb with a dated, judgmental tone.

It carries old-fashioned, moralizing baggage about propriety — using it today (rather than the adjective descocado/a, or a neutral atrevido) can sound stilted or unintentionally judgmental.