This is when something is running smoothly like the gears in a clock,but then asshole has to but in with his/her two cents and fuck everything up. The worthless opinion of this tool is like taking a monkey wrench and jammin it all up in the gears of your otherwise smooth running machine.
Everything for the party was going just as planned, until that asshole got all drunk and threw a monkey wrench into the clockworks.
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)