The 'I Know He Ate A Cheese' meme stems from a viral video of a young girl named Madyson who is seen passionately accusing her dog of eating her snack. Her deadpan delivery of the lines 'I know he ate a cheese' and 'He has the smell of the cheese' turned the clip into a classic internet reaction. The meme is typically used to highlight scenarios where someone is obviously guilty but trying to act innocent, or to humorously confront others about minor infractions. Its popularity lies in the girl’s adorable yet intense investigative skills, making it a go-to template for pet owners and snack lovers alike.