What is Leaving The Lid Off The Blender?
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To leave the lid off the blender is to invite disaster by rushing into something unprepared. It comes from the mess created by forgeting to check the lid is on properly on a blender leading to the walls getting coated in whatever it contained.
Guy 1: Dude! You didn't revise?
Guy 2: Yeah I know, I'm totally leaving the lid off the blender.
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Code name for porn.
Bob: "Why is it taking John so long to get ready?"
Bill: "I think he's taking a quick peek at ..