Telling someone your taking them out and changing your mind last minute,
I told the misses I was going to take her for a nicemeal on her birthday for months but I don't fancy it so I'm pulling a Corbyn and staying in instead.
Going into a task with unwarranted confidence and bravado and falling flat on your face.
"I can build this ikea wardrobe in a hour" 4 hours later as you have a mental breakdown you think to yourself "Im pulling a Corbyn, should have just paid for the assembly service".
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. PenguinBooks,1992. p. 38)