N*gga stfu
Fuck n*gga (my personal favorite, although not used very much)
Forreal / G-shit / Indeed / True / Truuu
Nah / Or nawww
Fuk wit it
Yeezus
9/10 times, I'll say these phrases in real life, or on Kik / AIM / Skype and etc., so I'm probably not being serious when I say these. I'm not ghetto, I swear.