The other definitions are correct, in that this means the man gets on all fours and tucks it between his legs so the other person can suck it. Important to note though, this position puts the sucker’s nose DIRECTLY in your ass so it is usually used dismissively.
“Oh they said that you should clean the kitchenbetter”
“Eh… they can suck my dick from the back”
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)