Jacknine is a conjunction of the terms jackass and asinine. Meaning that some one or something is both jackass and asinine. Can also be used to descibe a situation.
Chris, you are jacknine! Stop driving like a maniac!This whole day was jacknine - first my alarm didn't go off, then I was fired, and on top of it all my wife left me.Screw it, my alarm didn't go off, but my wife did! And just because she caught me in bed with Charlene.
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