When you have a chest infection, but still keen to give oral sex to your significant other. So you cough up a bit of green phlegm and spit it on them down under for a bit of extra lubrication.
Friend: "Hey, how have you been with this chest cold lately?"
"Yeah, good I gave my partner the Dirty Oyster last night."
Friend: "Oh that's nasty man."
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)