Arsy-varsy – head over heels, topsy-turvy, backside forward
I shouted, “Don’t jump on the bed!” But my four-year-old didn’t listen. He jumped up and down twice and then went arsy-varsy off the bed and onto the floor.
Also used in Isaac Asimov’s The Robots of Dawn.
Tell me about your “arsy-varsy” moments in the comments section.