a cloud of smelly fart(s).
usually left as a present to oncoming passers.
see:fart knocker
Al: What's that smell, Johnny?
Johnny: I believe we just entered an Ass Cloud.
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All of the rude/foul/unpleasant things you have thought of saying, but kept to yourself in your mind.
Guy 1: That was really mean. Where would you get an idea like that about your mother?
Guy 2: I kept it stored away in my ass cloud for the perfect moment.
The cloud created from a plume of volcanic ash.
Roxanne: Yeandle why aren't you on holiday?
Yeandle: That damn Volcanic Ass Cloud caused my flight to be canceled.