BOGOF BrE AmE , bog‧of /ˈbɒɡɒf $ ˈbɑːɡɒːf, ˈbɒːɡ-/ noun [uncountable and countable]
(buy one get one free) an offer from a shop to sell you two things of the same type for the price of one:
Take advantage of special offers and BOGOFs in supermarkets.