A crappy boxlike Nissan car, known for its disasterous online social media "competition" in Canada which turned out to be a complete sham. Rule changes dismissing the weight of public votes, selecting contestants purely on geographic location and judges heavily linked to winning contestants made it the laughing stock of the internet. Possibly the biggest failure of online marketing ever.
"Check out my new Hypercube, I only had to rim three judges to get this!"
by The Hypercube July 17, 2009
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(N) An object formed by 8 cubes that exists in four spacial dimensions as opposed to the standard three. A hypercube is entirely theoretical as it cannot be created by man. Also known as a tesseract.
Mrs. Paley: It's a tesseract!
Jerry: Of course! It must be a hypercube!
by ZZM v2.6 April 27, 2006
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Hypercube day is the day after Boxing Day, coined by Brady Haran (and to a lesser extent CGP Grey) in the awesome podcast called Hello Internet.

It is the 27th of December.

Called this because of the imagery of a box (as in Boxing Day), inside another box.
boy: I'm going to go for a walk in the woods on Hypercube Day bye!
girl: Wait you forgot your hotstopper
by sirnomnom6 December 28, 2018
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