The song "Gang, gang, gang" by Leo Fifteen is about the rapper's life in the streets and the struggles he faces. The lyrics talk about being part of a gang, dealing drugs, and the violence that comes with that lifestyle. Leo Fifteen talks about the pressures of staying true to his crew and the dangers of getting caught up in illegal activities. The chorus emphasizes the loyalty and strength of the gang, while the post-chorus warns of the consequences of crossing them. Overall, the song reflects the gritty reality of street life and the challenges faced by those involved in gang culture.