Stands for "Ripping my fucking dick off"
Used in cases when one, usually of malegender, is greatly upset with a situation.
In real-life conversation, the motion of pretending to grab the penis and forcefully removing it from the body is used, but only in extreme situations.
If you're at a party, and some asshole takes the last beer, an RMFDO moment is at hand.
"Dude, I took the rentmoney and blew it on some Chinese hookers."
"RMFDO"
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)