Ass (butt) in the air, posed, waiting for sex. Sexual position.
I flipped her butter side up.
by Arkham69 February 25, 2015
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An expression meaning that everything turned out alright like your toast landing buttered side up.
Her: It's been a rough year, a breakup, lost my job and my best friend..

Me: Chin up, you'll land buttered side up! You always do!
by Siouxsie Supertramp October 2, 2023
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