Sexton Blake

Sexton Blake

slang A counterfeit. The phrase comes from rhyming slang in which "Blake" rhymes with "fake." (Sexton Blake is a fictional British detective.) Primarily heard in UK. Don't be too impressed—I know for a fact that her bag is a Sexton Blake.
Farlex Dictionary of Idioms.
See also:
  • iron poof
  • a load of (old) cobblers' awls
  • Brahms and Liszt
  • half-inch
  • Jimmy Riddle
  • bottle and glass
  • north and south
  • Jack Palancing
  • bull and cow
  • cream-crackered