Don't use "debeściak". It's lame :) Write "Hemp Gru rządzi" It means: Hemp Gru rules. Or "Hemp Gru wymiata" means Hemp Gru rocks. I also like some Hemp Gru songs. Especially "życie warszawy". The video clip of życie warszawy is cool. It's kind of amateur, but it has the climate.
I guess I shouldn't express any more advices on street talk then, I'd rather thought that "Hemp Gru rządzi" is lame (in Polish), but I definitely don't have a feel for this kind of speech :)