Hahaha I've been wondering all day about that acronym! I was close; my best guess was "Though Also Formerly Know As".
I borrowed it from Prince. Or more accurately, reporters who wrote about him.
In the early '90s, he changed his stage name to a funny-looking glyph that had no pronunciation. He handed out computer discs with his glyph as a font wingding so it could be used in print, but most magazines and newspapers didn't give a flying fart about using his glyph and just started calling him The Artist Formerly Known As Prince, or TAFKAP for short. After a couple of years, Prince dropped the stupid glyph and took his former name back.