Definition of fug noun from the Oxford Advanced Learner's Dictionary

 

fug

 noun
noun
BrE BrE//fʌɡ//
 
; NAmE NAmE//fʌɡ//
 
[singular](British English, informal)
 
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air in a room that is hot and smells unpleasant because there are too many people in the room or because people are smoking the fug of stale smoke and sweat Word Origin late 19th cent. (originally dialect and schoolchildren's slang): of unknown origin.