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Where one person eats a bunch of bananas and chases it with ex-lax. Then you dress as a monkey then proceed to take a massive fountain-like dump on your partners back.
Last night was amazing til you bananabacked me in my sleep!
by Sprint monkey shart February 13, 2010
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The arch in some chick's backs when standing, showing off their ass. The chick's back curves like a Banana, making her ass appear to be more pronounced than without a Banana Back.
A: Hey, Katie has a nice Banana Back! I could stare at that all day!

B: Yeah, I know! that ass is seductive!
by kikr47 November 20, 2008
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