apple-pie order

noun

1. excellent or perfect order.

   Her desk is always in apple-pie order.

apple-pie order

noun

1. informal,  perfect order or condition

Word History and Origins

Origin of apple-pie order¹

First recorded in 1770–80

Idioms and Phrases

Extreme neatness, as in David keeps his financial records in apple-pie order. This term is generally believed to be an English corruption of the French nappes pliées, “neatly folded linen.” [Early 1600s]