Sounds like fizzy deodorant...
(
Guineapiggy Fuzzeh!,
Tue 27 Sep 2005, 17:11,
archived)
or
the emissions from an old car..
(
Londingham .,
Tue 27 Sep 2005, 17:12,
archived)
Your answer has more hummus than mine
let's go with that
(
Guineapiggy Fuzzeh!,
Tue 27 Sep 2005, 17:18,
archived)