Blood in blood out for my brother, give me a pistol
Royce da 5'9 and Kid Vishis are biological brothers. “Blood in blood out” is a code most street gangs follow, but also refers to them being of the same blood. The meaning of the statement mainly is: you have to kill/harm someone to get in the gang, i.e. “blood in”; While “blood out” means that the only way out of the gang is in a box. You just can’t simply turn your back on your gang of brothers(in this case actual brothers and walk away. Kid Vicious is stating that he is ready to kill and ready to die for his family.
Might also be a reference to the movie “Blood in, blood out”:
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