Wal-Mart has filed a federal lawsuit over a warped version of its logo appearing on T-shirts and on a Web site with the word “Wal-ocaust” in blue over an Iron Eagle clutching a yellow smiley face.

Charles Smith, a 48-year-old computer repairman from Conyers, Ga., began selling T-shirts reading “I (heart) Wal-ocaust” last year, and he displays the more elaborate logo on his Web site.