Yeah, in that case, it's kind of like that sort of, "Yo-yo-yo, gee, peace-out" kinda thing... ironically, even though it's more recent, "Bling" is now considered out-dated. Then for something like "Yo", which I use frequently myself, most people think you have to be "hip" to say that, but it actually dates back well into the 50s, as depicted on M*A*S*H whenever someone addressed Henry Blake, and he would respond with a flourished, "Yo-o!"
Slang seems to come and go in vicious cycles. Like when I was in middle school, for an entire year, one word that was constantly tossed around among kids was "Trifolin" (not even sure that's how you spell), and to this day, I'm still not even sure what it means, but it didn't last long... I think it became a part of regular vocabulary at that point in time because of a pop song, I'm pretty sure.
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