When someone says 'balee dat' they are either trying to convey their agreement with someone or trying to let you know that they intend to do something whether you like it or not. In my experience, fangbangers say this a lot.
1. Term used by listeners of hip-hop and rap,meaning "believe that". Often spoken under the influence of marijauna or a 40. Usually followed by the word 'shit'.
You got weed and no papers? No pipe?
Get me uh uh a potato, some tin foil, and a scuba mask. No no. Wait gimme a Coke can, a thimble and a pocketknife.
Damn,go to the sto and get some White Owls, fool. No papers. You bleedat shit?