What’s the thing with In-N-Out Burger and the number 67?

In-N-Out Burger hit a major milestone on Wednesday, Dec. 10, officially debuting east of the Mississippi River in Tennessee.
But that’s not the news that captivated the nation.
Social media is buzzing with reports that the Southern California chain has stopped numbering its orders 67 because the term “six-seven” is meaningful to youthful social media users.
The reasons aren’t clear, according to Dictionary.com, which declared “6-7” the word of the year in Octo