masturbating in the bathroom while your roommates are out and are unsure of when they'll return; IE, maturbating while home alone.
Pun on the word "caulking" (pronounced "call-king"), the rubbery silicone sealant around tubs and sinks.
roommate: What the hell were you doing in the bathroom when I got home? You were in there for a while.
deviant: Oh just Macaulay Caulking the bathtub tiles... you didn't leave a note so I didn't know when you'd be home.
roomate: gross
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)