"The tinpot style," said Mr. Britling at last in a voice of extreme bitterness.
When they came at last, in their tinpot hats, they got out half a dozen big squirts and rushed into the building with them.
England will blow your trumpery little fleet out of the water and sweep your tinpot army into Siberia for this.
Inferior; petty; tinhorn: tinpot Napoleons/ individual liberty from coercive tin-pot bigots
[1838+; apparently in part fr the image of a ludicrous military figure wearing a grandiose tin helmet, a sort of tin soldier]