The online equivalent of "Black Friday" this expression refers to the Monday after the Thanksgiving holiday. It goes like this: In the brick-and-mortar world, the day after Thanksgiving is one of the year's biggest days for shoppers and retailers. The longtime nickname "Black Friday" historically came from the notion that this is the day when sales pushed money-losing stores into the black. In the click-and-mortar world of online shopping, the following Monday is the peak day for shopping and online transactions, thus it is cyber Monday (or "Black Monday"). The reason it occurs on Monday is attributed to the fact that consumers take advantage of high-speed Internet connections at work to do their holiday shopping.