adverb Slang: Sometimes Vulgar.
in an order or way reverse from the usual: You've sewn the sleeve on assbackwards.
in a manner incongruously or preposterously counter to what is customary, probable, or feasible: The plan fell apart because everything leading up to it was handled assbackwards.
Origin of assbackwards
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019