The term 'Mlem' is an onomatopoeic internet slang word used to describe the sound or action of an animal sticking its tongue out, usually to lick its own nose or simply peeking out for a split second. While often confused with a 'Blep'—which refers to a tongue left sticking out unintentionally—a 'Mlem' is considered more active and deliberate. The term gained massive popularity on platforms like Reddit, Tumblr, and Instagram within the r/mlem community, celebrating the adorable and goofy side of pets. Today, the Mlem meme is a staple in wholesome internet culture, used to express cuteness, hunger, or just general silliness in the animal kingdom.