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An unpleasant, probably brown, probably smelly, probably sticky object, coating, food or person.

Originates from television series 'Men Behaving Badly' in which writer Simon Nye wanted to introduce a word into the language (as Red Dwarf had done with smeg) but failed miserably.
"It was cooked in a smingey sauce"

"I looked behind the sofa and whatever had fallen down the back had gone all smingey"
by Gav MR February 14, 2005
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