This is the 638th most frequent Catalan word.
passada
The Catalan word "passada" means "pass" or "passing" and can also refer to a "sweep," "streak," or something from the "past," depending on the context.
The word "passada" here is used as the feminine past participle of "passar," referring to "last" in temporal context, modifying "setmana" (week).
La setmana passada vaig anar a Barcelona.
Last week I went to Barcelona.
In this sentence, "passada" colloquially means something extraordinary or amazing, serving as a noun describing the event.
Va ser una passada veure aquell espectacle.
It was amazing to see that show.
Here, "passada" denotes a single pass or stroke with a tool, functioning as a noun in the context of an action.