How about "iontknow" rather than I don't know. I hate when people mash multiple words together. I also hate military lingo. I like slang though some of it anyway. As far as hipster/gangster/ghetto talk if you have ever said what's up or yo or bling that would be hip hop not ghetto they are not synonymous. Calling someone a rat would be gangster "prohibition era gangster lingo" yolo is also a very old acronym just recently becoming trendy.
Long live the king
"Stand for something of fall for anything"