spark out

Definitions

Slang

  • adjective fast asleep or completely unconscious. The expression is now a mainly working-class colloquialism; it was formerly a rustic expression evoking a dead fire or extinguished candle. Sparko was a variant form heard in the 1980s.
  • adverb fast asleep or completely unconscious. The expression is now a mainly working-class colloquialism; it was formerly a rustic expression evoking a dead fire or extinguished candle. Sparko was a variant form heard in the 1980s.
http://www.dictionarycentral.com/definition/spark-out.html