chowdar, n. — Green’s Dictionary of Slang

chowdar n.

also chowder

[? Anglo-Chinese, but note chowder-head n.]

a fool.

1873		Sl. Dict. 118: Chowdar, a fool – Anglo-Chinese.
1895		‘’Arry on Harry’ in Punch 24 Aug. 90/3: There’s chick in it, Harry, and that’s what you chalk-witted chowders ain’t got.