The 'Surprise Buttsecks' meme is a legendary artifact of early Team Fortress 2 and Garry's Mod culture, first appearing around 2008. It features the Spy character from TF2, often distorted or animated in a frantic manner, sneaking up on an unsuspecting victim to deliver the titular line. The audio originated from a YouTube video titled 'Spy's Surprise,' which combined a voice clip from the game with a high-pitched, sped-up soundtrack. It quickly became a staple of YouTube Poop (YTP) and GMod animations, symbolizing any sudden, unexpected, and often absurd interruption. Decades later, it remains one of the most recognizable catchphrases from the golden era of Valve-based internet humor.