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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.
by Zorlock April 21, 2005
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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.
by The goddamn Batman November 15, 2013
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