Duolingo is a popular language-learning app whose green owl mascot, Duo, became an internet meme for its persistent lesson reminders and streak notifications. Short clips associated with the app spread through TikTok, YouTube Shorts and meme soundboards, where creators use them to joke about procrastination, guilt and unfinished homework. The humour works because many viewers recognise the app immediately, even without seeing its logo. As language-learning memes have stayed popular, the sound remains a quick shorthand for being reminded to practise, especially when a daily streak is at risk.