It does not "screen out" jailbait with fake ID, but then that never was the purpose, was it? Best ice breaker since the Titanic!!
In math class in high school, we used to render the equation as B4i√u RU/16 ,the legal age in Canada where I was living at that time.
In the context I saw it, it was even funnier, since it was a poker table. 🙂