When an individual (knowingly) counterfactually attempts to prove a statement or theory to be wrong or false simply to be difficult or contrary.
Person #1: I've just had a someone trying to tell me Elvis, Princess Diana, MJ & 2pac are not dead, but are lizard people that have returned to living in a secret bunker on Mars and ruling the Earth remotely VIA Donald Trump...
Person #2: Sounds like you've been Sheloff'd pal.
Person #1: Yeah, you're probably right, they were probably just Sheloffing me. No way they could believe that nonsense.
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)