A person who you don't normally associate with except for on weekends. Also a person who you don't normally associate with unless they have something to offer.
Girl #1: "I don't have any money for the bar this weekend..."
Girl #2 "OH! Call up your weekend friend, she'll foot the bill!"
Girl #1: "Good idea!"
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)