To not only skip out on your partner in crime so dat he gets da blame for your "combined" transgressions, but you also abscond with whatever ill-gotten booty dat said hapless cohort helped you to "acquire"!
In da "Adventures Of Huckleberry Finn" tale, da King and da Duke had both secretly planned to bilk da other out of da sack of gold --- i.e., each one of said selfish 'n' shameless shysters possessed da classic "no honor among thieves" mindset, and thus was going to pull da disgraceful "run off and leave him NOT holding the bag" on his unwitting accomplice!
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)