What Ifc movie is this????

This movie has been in my head for a while. All I remember is this african kid I think in one scene he yells at this chick and in the setting there's a car standing on bricks and he cusses at the chick and some hobo starts to crack up. Throughout the movie he hangs around with this one white chubby kid who wins a dog fight with his dog. I know this info is weird but could you guys help me thanks.