(Keep it 100) To be keepin it one hunned means you are awesome, stayin cool, stayin chill, stayin happy, everything is all good. In the Christian sense of the phrase, it would mean, staying pure, keepin a close relationship with God 24/7 and staying holy. It means you've successfully stayed away from a habitual sin that always is comin up in your life. In the sense of a relationship it would mean everything is going well between the two people.
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)