The phrase "what the flex" can have different meanings depending on the context. Here are some possible interpretations based on the search results:

• Wtflex: This is the name of a company that sells fashion products and services. They describe themselves as customer-focused and aim to provide high-quality items to their clients.

• Flexbox: This is a CSS layout module that allows web developers to create flexible and responsive designs. "What The Flexbox?!" is also the name of a free online course created by Wes Bos that teaches how to use Flexbox. The course consists of 20 videos that cover the fundamentals of Flexbox, as well as practical examples of how to use it to build different layouts.

• Flex position: In the context of fantasy football, the "flex" position refers to a roster spot that can be filled by a player from different positions, such as running back, wide receiver, or tight end. This gives more flexibility to the team owner when selecting their lineup, as they can choose the player who they think will score the most points.

• Other: "What the flex" could also be a made-up phrase that doesnt have a specific meaning or use. However, there were no relevant search results that support this interpretation.

In summary, the meaning of "what the flex" depends on the context in which it is used. It could refer to a company name, a CSS layout module, or a fantasy football position.