that's the bite of 83, the bite of 87 was: burring a child's birthday at Freddy's pizzeria, the souls in the animatronics got a little too happy and went on a killing spree mascaraing all the employees.
That's alright, I honestly don't blame you.
For a little more context, after Markiplier saw the bite scene of fnaf 4, he was in absolute shock before saying "Was that the bite of 87!?!?" which became a meme afterwards.