Blue Cloud

A patch of blue sky on an otherwise fully cloud covered sky

Oh look! It's a blue cloud!

Blue Cloud of Profanity

A "blue cloud" is a dangerous area effect resulting from rapid, sustained utterances of profanity. Those in the area of effect experience either anxiety or elation depending on their idiosyncracies. Often encountered at truck stops or in the homes of desperate housewives. See also "turn the air blue".

If this therapist dislikes profanity, it won't work for us, because there'll be a blue cloud of profanity in the room.

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Blue Cloud of Death

Refers to the potential failure of a cloud computing network.

Google experienced a massive blue cloud of death yesterday that shutdown 10 million subscribers of their G-storage service.