The 'Boom! Pregnant!' meme originates from the animated series American Dad!, specifically spoken by the character Klaus Heisler. It characterizes a moment of extreme confidence or a sudden, unexpected outcome that is humorously attributed to a sheer force of will or a single action. The phrase quickly caught on across social media platforms like TikTok and Twitter, often used in reaction to attractive celebrities, impressive feats of strength, or simply as a non-sequitur joke about fertility. It serves as a hyperbolic way to express how effective or impactful a certain situation is, turning a life-altering event into a comedic catchphrase.