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A trench rat is another name for a free meal.
We hadn't seen rations for days, until I saw a trench rat...
A free meal is a meal that you paid nothing for or found, usually by non-traditional means, i.e. food found in a garbage can or roadkill you intend to eat.
When you haven't eaten in 8 days due to low rations in the trenches and you see a horde of trench rats running beneath you and you think, damn. That's a free meal.