When two people have been hooking up for an extended period of time but neither will acknowledge the relationship. They like to say they are just friends but spend lots of time just the two of them and sleep together.
Dude 1: I'm busy tonight. Leah and I are going to the movies.
Dude 2: Hanging out with Leah again, huh? How is that girlfriend of yours?
Dude 1: Dude, she is totally NOT my girlfriend. We're just friends.
Dude 2: Bro, you can't bang a girl for 6 months and tell me you're just friends. She is totally your common law girlfriend.
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)