The Spongegar meme, often synonymous with Primitive Sponge, features a prehistoric version of Spongebob Squarepants from the episode SB-129. Characterized by his hunched posture and startled expression, the image exploded in popularity in 2016 across social media. It is primarily used to represent feelings of intense alarm, social anxiety, or being caught off guard in a relatable yet awkward situation. The template’s versatility has made it one of the most enduring and recognizable reaction images in the Spongebob meme canon.