For someone to diss you/mock you based on a characteristic of yourself, your personality, clothes etc. in front of a lot of people
Example of a Roast Whipping Post:
Teacher: Ok Class, that's the bell everyone is dismissed. Stacy, please see me after class.
Stacy: Why? Can't get a date for prom?
Teacher: If that was the case I would've asked one of the pretty girls.
Class: DAYUM!!!!
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)