The next sentence: Una copa de vino, por favor.
In this restaurant all the staff wear shorts – so they are naked from the waist down (una). Your waiter has brought along dad’s suitcase, which is all stretched because there is evidently a lot inside (copa de – from the German “Koffer”, “Papa” and “gedehnt”: “suitcase”, “dad” and “stretched”). In the suitcase sits a winemaker grading the wines (vino – the German “Wein benotet” means “grades wine”). Then he walks out through a gate (por favor).