A Sometimes Sober Saturday is a Saturday that qualifies as being sober. This can be for any reason. It is really more of an event, than an adjective.
Joe: "Man, last night was boring, I had a sometimes sober Saturday. :("
Tim: "I've got a lot of homework, I think I'm going to participate in a sometimes sober Saturday."
A specialty; something someone is, or one could be, very good/skilled at. It can be used to replace the word "thing" when deemed acceptable by the user.
(origin- began slang use by THE iZzy)
person 1:"Kip why don't you play baseball."
Kip: "It's just not my facade ."
friend 1: "Dude, you are so good at that."
dude: "Yeah I know, it's my facade ."