The 'Parry This You Filthy Casual' meme features a medieval knight unexpectedly brandishing a modern handgun, subverting the expectations of fantasy combat. While the phrase 'filthy casual' was already a popular elitist insult in the gaming community, particularly among Dark Souls players, it became legendary when paired with this image around 2018. The meme represents a situation where someone brings an overwhelming or 'cheating' solution to a fair challenge, effectively ending the debate. It is widely used to mock elitism or to depict a hilarious escalation in a conflict where traditional rules are suddenly ignored.