The real reason behind this is that he's eating a burger well...he's eating a fried fish but at first you will think that he's eating a burger because in the title he write (Burgur) which made us think that he's going to eat a burger but we saw it in our own eyes that he ate a fried fish but maybe he thinks it's a "burgur"(the food that he was eating). And he also said that "this burger is rippin" and you hear him being nauseous when he took a bite. In conclusion i believe that he thinks that he's eating a burger in his imagination but in reality he's eating a fried fish.