Webster's Revised Unabridged Dictionary · 1913

Chop suey

Chop suey

[Chin. (Cantonese) shap sui odds and ends, from shap for sap to enter the mouth + sui small bits pounded fine.]

A mélange served in Chinese restaurants to be eaten with rice, noodles, etc. It consists typically of bean sprouts, onions, mushrooms, etc., and sliced meats, fried and flavored with sesame oil. [United States]

Also: Chop sooy