I need a hip hop song name, don't really know what it's called?

I heard this song in either around end of October beginning of November. I was at Annie's bar. I don't have any lyrics unfortunately, i know this doesn't help but there is a repetition of 3 gunshots, a gun , and then 2 more gun shots throughout the song. it's hip hop. something like... "saying bang bang bang, we back it up (ing) bang, bang." i dont really know if these are the lyrics. it's not MIA and it's not tupac. thank you anyone! i know this is not clear at all.!