From Longman Dictionary of Contemporary Englishfugfug /fʌɡ/ noun [singular] British English informal AIRair inside a room that feels heavy and unpleasant because of smoke, heat, or too many people the fug of the bar
Examples from the Corpus
fug• Some time during the muzzy fug of these dissipations, a decision had been reached.• After the stale fug in the tiny cabin, she gulped down the clean sea air, the car window wide open.• Really, Watson, you must clear the fug from your brain.• I couldn't keep my eyes open, I felt as if I was suffocating in a warm fug of words.Origin fug (1800-1900) Perhaps from fog 