adjective in the wrong order. An intentionally jumbled ASS BACKWARDS. US quotation expert Fred Shapiro recently found the term used by Abraham Lincoln in 1865, a substantial antedating US, 1865
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bass-ackwards
Opposite or contrary to what is expected, completely disordered or disarranged, or that which is done incompetently. A euphemistic rearranging of "ass-backwards" (meaning the same) to emphasize the disorder at play. That's the last time I let you fix the electrical work by yourself. You've wired it all bass-ackwards!I must not be completely awake yet, I just put my pants on bass-ackwards!