A two-faced person or a person who has a clean image but does things secretly that are bad or evil is an "Aunt Becky".
I was supposed to get into the club but that girl Aunt Beckied you.
She pretends to like you but she's really Aunt Beckian.
You think she's a good girl but she's nothing but an Aunt Becky!
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)