Definition of stumer in English:

stumer

noun

British
informal
  • 1A worthless cheque or a counterfeit coin or note:

    [as modifier] ‘he got your picture back from the man who gave you a stumer cheque’
  • 2A failure:

    ‘his piece was a stumer, a complete flop’

Origin

Late 19th century: of unknown origin.

Pronunciation:

stumer

/ˈstjuːmə/