Bang Bang

The song Bang Bang by Bestla is the Bitch tells the story of a young love that ends tragically. The first verse introduces us to the characters, a young girl and boy who play together, riding horses made of sticks. The boy always wins their playful fights, but they still enjoy spending time together. However, things take a dark turn in the chorus when the girl is shot down by the boy, with the "bang bang" of the gun represented by the repetition of the phrase in the lyrics.
The second verse jumps ahead to when the girl is older, and the boy is now her boyfriend or perhaps her husband ("I called him mine"). They look back fondly on their childhood memories of playing together, but the shadow of the earlier shooting still lingers in the repetition of the "bang bang" chorus.
In the third verse, something has happened to the boy, and he is no longer with the girl. She doesn't know why he left or why he didn't even say goodbye. She is still haunted by the memory of how he shot her down in the past, and perhaps the repetition of her own shooting of him in the second chorus represents her guilt or regret. The final lines of the song show her still mourning the loss of her lover, and the pain that was caused by their violent past.