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.
That dude is spreading ICBINB! onto his baked potato crisp and downing a six-pack of diet Coke...
Flavoured ICBINB! spray? That's gotta be the most ingenious invention since matzo...you can eat it like those sour spray candy things or use it as cologne!
acronym for "I can't believe it's not..." (from the advertising for the spread I Can't Believe It's Not Butter)
Used in a sarcastic manner to denote something ersatz or, more usually, a person or organisation poporting to be a new or changed version.
With regard to ICBIN New Old Labour under Ed Milliband...
A tight, tangled knot of loose hair and lint that forms inside clothing during the clothes dryer cycle. It typically hides inside garments, causing an annoying lump or a phantom tickling sensation against the skin until it is found or falls out onto the floor during folding.
I was folding my clothes and a huge hair spider fell out onto my hand