The Plate Toss meme comes from the 'It's Always Sunny in Philadelphia' Season 11 episode 'Mac & Dennis Move to the Suburbs.' In the scene, Mac serves Dennis his 'famous' mac and cheese after a long, stressful day of domestic life. When Dennis criticizes the meal yet again, Mac snaps and throws the entire plate across the room in a fit of rage. This moment perfectly encapsulates extreme frustration and the feeling of being totally 'done' with a situation. Online, users use this template to show rejection, sudden anger, or the dismissal of an unwanted suggestion or task.