fug
Concise Oxford English Dictionary © 2008 Oxford University Press:
fug/fʌɡ/
▶noun Brit. informal a warm, stuffy atmosphere.
– derivatives
fuggy adjective (fuggier, fuggiest).
fuggy adjective (fuggier, fuggiest).
– origin C19 (orig. dial. and schoolchildren's sl.): of unknown origin.
'fug' also found in these Oxford entries:

