It means “The fuck you think you talking to ?” Typically said when you ask your momma a question and she calls you by your first name, Take my advise and don’t run, it makes it worse
Momma: “And where the hell have you been ?”
Girl: “Outside, why ?”
Momma: “Are you really giving me sass right now ?, Via a device ?”
Girl: “huh? How am I being sassy, are you okay ?”
Momma: “TFYTYTT !”
Girl: “what does that even mean ?”
Momma: “The fuck you think you talking to ? Little bitch I know you snuck out open the fucking bathroom door”
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)