Blue Cloud 

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

Oh look! It's a blue cloud!

Blue Cloud by Doginim June 21, 2016

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.

Blue Cloud of Profanity by Baalorian October 11, 2015

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.

Blue Cloud of Death by sweets1970 April 5, 2009

Put Clouds on Blue Sheets 

The act of cumming on a blue bed sheet, blanket, etc.

Guy: Shit, I just put clouds on blue sheets, my moms gonna fuck me in the ass now

Put Clouds on Blue Sheets by Fluff_Sucker_69 June 9, 2018