It Actually Has Its Roots In Prohibition.

https://news.sky.com/story/former-fbi-director-james-comey-investigated-for-post-threatening-donald-trump-13368759

Meaning to evade arrest by using the 86 Bedford street exit of Chumley's bar.

As in; "James Comey 86'd his chum Hillary Clinton."

The term; "Dive Bar" comes from illegal prohibition era bars being hidden in basements. So you would almost dive head first down the steps to get into them.

All of which is rather useless trivia to carry around in your head.