samefag noun 1verb 1forms 3 noun1 •(Internet, vulgar) Someone who replies to their own post on 4chan or similar imageboards pretending to be a different user.The board (or possibly just a samefag?) had spoken: Tao Lin had won. — 2014 verb1 •(Internet, vulgar) To reply to one's own post on 4chan, pretending to be a different user. formssamefagged · samefagging · samefags