I don't have time to watch the whole video to find out when the hostess says "slap-up". A quick Google tells me it means something like "excellent". If so, we might say a great or fantastic dinner. Lots of more and less formal synonyms exist.
"A feast" works for me, maybe with an intensifier as in "a real feast" or "a hell of a feast". My wife and I are both drawing a blank on a slangier way to say it. Unsurprisingly, French has a word which may be a perfect translation: une bouffe.