Maggie's drawers
noun US military slang
A red flag used to indicate a miss in target practice.If the slang term "Maggie's drawers" was in use during World War I, the reference was probably too indelicate for many printed examples to exist....
- Evidently "Maggie's drawers" was inspired by the title of a bawdy song on that very subject.
Origin
1940s: said to be in reference to a song entitled Those Old Red Flannel Drawers That Maggie Wore.