Green’s Dictionary of Slang

(US short order) to order fried eggs turned over.

1913		Coconino Sun (Flagstaff, AZ) 26 Dec. 2/3: Railroad Eating House Lingo [...] The customer said, ‘Beg your pardon, sir, but I would like to have the eggs turned over.’ ‘Blanket the headlights!’ yelled the waiter.
1945		F.H. Hubbard Railroad Avenue 325: [as 1913].