Green’s Dictionary of Slang

chop-chop n.

(US) food.

1951		N.Y. Herald Trib. 16 Dec. II 5: Chop chop: food or any allusion to food or eating.
1956		H. Gold Man Who Was Not With It (1965) 26: ‘Chop-chop?’ Grack asked, handing a sandwich toward me.
1968		Army Times ‘Army Talk in Vietnam’ 10 Apr. n.p.: chop-chop: food, or eat.
1979		(con. c.1970) G. Hasford Short Timers (1985) 56: ‘You give me chop-chop? You souvenir me?’ The orphan grabs at the Hershey bar and jerks it out of Chili Vendor’s hand.