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ICBINB! noun 1. Abbreviation for a margarine (fake-butter) product, I Can't Believe It's Not Butter!. The stupidest abbreviation (nobody can decipher what the hell ICBINB is unless they're told) for the stupidest product (if you're worried about the calories in butter, don't eat fake butter, just stop eating the damn butter!) in the world.
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