Former FBI director James Comey says that he’s still a bit bewildered over how a seemingly innocent Instagram shot of shells arranged in the sand led to allegations from Donald Trump among others that he was calling for the president’s assassination and to an interview with the Secret Service.

The Merriam-Webster dictionary traces “86” to “1930s soda-counter slang meaning that an item was sold out. There is varying anecdotal evidence about why the term eighty-six was used, but the most common theory is that it is rhyming slang for nix.”

Trump and top officials in his administration are suggesting Comey should be imprisoned for a phrase that has frequently been used innocuously in politics in recent years.