BOGO is an abbreviation for "Box Logo," which is what Supreme's logo is coloquialy known as.
BOGO is an exclusive numbered slipcase set containing copies of Art on Deck and Object Oriented.
Supreme creates only one new shirt per year with the 'BOGO' on it, and only one special edition for the opening of any new boutique.
Not surprisingly, the BOGO items regularly reach incredble prices with t-shirts or hoodies selling in the realm of $500 - $2,000 each!