The line comes from The Real Slim Shady, released by Eminem in 2000 as the lead single from The Marshall Mathers LP. Slim Shady is Eminem's alter ego, and the song mocks celebrity culture and imitators while repeating the stand up hook as a chorus. The phrase quickly became one of hip hop's most quoted catchphrases and survived through radio, music video parodies, and later meme edits. Its familiar call and response structure still works online because almost any crowd, costume, or duplicate reveal can be framed as a search for the original.