Chop suey \Chop su"ey\ or sooy \soo"y\ . [Chin. (Cantonese) shap sui odds and ends, fr. shap for sap to enter the mouth + sui small bits pounded fine.]

A m['e]lange 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. [U. S.]

Source: Webster's Revised Unabridged Dictionary (1913)