wowser

Definition

Slang

  • noun a spoilsport, puritan or ‘wet blanket’. A word which has been recorded in American usage, but not in Britain; wowser originated in the late 19th century and is of uncertain origin. Most suggested etymologies refer to ‘wow’ as a roar or bark of disapproval or an exclamation of shocked surprise.
http://www.dictionarycentral.com/definition/wowser.html