EMFDYSI
Acronym for "English, motherfucker, do you speak it?!", a line from Pulp Fiction. Used on the Internet in response to nonsensical writing.
Person A: "U C4N7 B337 MY 1337 5Kii15!!!!!!!!!! YA N00BS!!!!!"
Person B: "EMFDYSI?!"
Person B: "EMFDYSI?!"