It's one of the ways to call a sanitary cup. Inodoro, toilet, toilet. It can also mean pool, pool, pool, pond, pool, lagoon or pond. Derogatory well derivative.
It is well with a derogatory ending '-eta', so they are written with 'c' for the toilet bowl, the pothole, the lagoon, . . .
poceta is incorrectly written, and should be written as "poseta" being its meaning: a poseta is where bred fish not where to put the coffee