The meme featuring "Triangle Jerry" originates from the beloved cartoon series "Tom and Jerry," where Jerry Mouse often outsmarts Tom Cat in a series of slapstick chases. In this particular meme template, Jerry is envisioned in a triangular form, likely exaggerated for comedic effect. This version gained popularity on Reddit, specifically in the "Gibus Squidward" subreddit, which is known for its playful and surreal content. The "I know he ate a cheese" line humorously captures Jerry's mischievous nature and his love for cheese, which is a running gag throughout the series.