Jokes aside, the actual implication of "Meat's back on the menu, boys!" is that Hobbits know what a menu is, not Orcs, as they're the ones telling the story.
Orcs were created for military action and presumably wouldn't have bothered with tables, as that's too much resources away from their singular purpose, so the equivalent phrase wouldn't be "back on the table" but presumably some expression that only makes literal sense to orcs.
And so Frodo, when he added the adventures of the Fellowship to Bilbo's memoirs, translated it to an idiom that would have been familiar to his assumed audience of other Hobbits.
It's also possible that Ugluk said nothing that was intelligible to Merry and Pippin, who later attempted to convey to Frodo what they had witnessed based on their understanding of what was going on.
"And the big one was all like, 'Looks like meat is back on the menu, boys!' and they all ate the other orc."
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