Ayy lmao became a staple caption for alien pictures online in the early 2010s, spreading across Tumblr, Reddit and image boards as a deliberately silly greeting. The phrase paired a casual ayy with lmao to suggest aliens making contact in the most human, internet way possible. As short form video grew, editors turned the text meme into a spoken soundbite for edits, shitposts and reaction clips. It stays popular because it is instantly readable even without the image, signalling random humour and fake first contact in under two seconds.