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Resembling arse to the latter. This word was born by me spending too much time working for a large corporate company where buzzwords nobody dared to question the meaning of (for fear of looking stupid) were in great abundance.
"That was a backsideous statement" - i.e. "You talk crap".

"Backsideously entertaining" - Not in the slightest bit interesting.
by Paul September 10, 2004
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