It's a stealthy way of calling someone a masochist. if you read "Osamaru" backwards you get the message "Ur a maso".
Guy 1: Man that crazy girl abuses me everyday!
Guy 2: Why won't you break up with her then?
Guy 1: I still like her though.
Guy 2: Dude I didn't know you were such an osamaru
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)