"67," pronounced "six seven," spread from a rap song, through sports and social media, to classrooms and homes across the U.S. But even the artist who coined it struggles to define it.

One could argue that there are varying levels to the randomness. For example, Kevin Hart’s Verizon commercial may feel slightly more elevated and acceptable than, say, LeBron James’ Royal Kingdom ad. ...

If you're among the people confused by young folks who laugh at the punchline 6-7 or use "mogging" as a compliment, we have two bits of good news for you. First, your confusion is kind of the point ‒ ...