Definition from Wiktionary, the free dictionary
Proper noun 
Flying Dutchman (plural Flying Dutchmen)
- (nautical, mythical) A Dutch-flagged clipper that is very fast sailing, and never makes it to port, seen on the high seas, where upon being hailed, occupants request information on persons long dead, or leave messages for said people. It is considered bad luck to meet said ship.
- (idiomatic) A ship of similar qualities to the Flying Dutchman.
- A ghost ship.
mythical Dutch-flagged clipper