The 'Yeah, This Is Big Brain Time' meme originates from a 2019 video by popular YouTuber Markiplier titled 'BALDI'S BASICS IS EVEN SCARIER NOW.' In the video, Markiplier makes a self-deprecating joke about his own intelligence while playing the game, leading to the iconic line. The meme quickly spread across Reddit and Twitter, typically featuring an image of Markiplier's face distorted or enlarged to signify a 'massive' brain. It is primarily used ironically to celebrate a solution that is either blindingly obvious, unnecessarily complex, or actually quite foolish. It perfectly captures the humorous gap between perceived brilliance and actual execution in everyday life.