> In antiquity it was more what we might call street food
In context, though, the original commenter considered things like street hotdog vendors to be fast food. That is not unlike the kind of delivery you would find in antiquity, even if the actual food product differed.
> What really defines fast food is mass production and uniformity.
Technically, what really defines a term is how it is used in a certain context and how it works towards reaching a shared understanding, which was achieved with the original use of fast food found in this thread. You are right that the definition that emerged here does not align with definitions found in other contexts, but those other contexts are irrelevant to this particular context.
> It’s a weird thing - people in the USA know what you mean by fast food and somehow McDonald’s under a heat lamp counts (rarer now but still found) but burgers at the gas station under a heat lamp don’t count.
In context, though, the original commenter considered things like street hotdog vendors to be fast food. That is not unlike the kind of delivery you would find in antiquity, even if the actual food product differed.
> What really defines fast food is mass production and uniformity.
Technically, what really defines a term is how it is used in a certain context and how it works towards reaching a shared understanding, which was achieved with the original use of fast food found in this thread. You are right that the definition that emerged here does not align with definitions found in other contexts, but those other contexts are irrelevant to this particular context.