[112233]

Not OP, but it probably is meant one or two meat patties of code between two buns of code, as opposed to a meatball of code with many spaghetti pf code.

What it is with computery terminology being almost 100% allegorical?

Most other trades I know have their own words for their things. Computer people seem to stand out this way

[wheybags]

Compared to most other trades, computing is in its infancy