The 'Captain America’s Ass' meme originated from the 2019 blockbuster Avengers: Endgame. During a time-travel sequence to 2012 New York, Tony Stark makes a snarky comment about Steve Rogers' outdated suit not doing his physique any favors, to which Scott Lang (Ant-Man) defends it by calling it 'America’s Ass.' Later in the film, Steve Rogers himself looks at his past self’s defeated body and agrees with the sentiment. The scene became an instant viral hit, symbolizing both a playful meta-commentary on the actor Chris Evans’ physique and the lighthearted camaraderie within the MCU. It is widely used to express admiration, national pride in a humorous way, or to highlight any 'impressive' realization.