When you are locked inside a pizzeria (specifically with animatronics), and one of the animatronics comes up to you and forces you to eat a special pizza laced with laxatives. You then are forced to go to the bathroom where the animatronic comes in and gives you a Blumpkin.
Yo dude after you left the pizza place last night Chica gave my the Freddy Fazbear Blumpkin.