少年我背着书包去酒吧
[shăo nián wŏ bèi zhe shū bāo qù jiŭ ba]
This nickname paints a picture of youthful rebellion and contrast: 'I'm young, carrying my schoolbag which usually goes to school, but I go to a bar instead.' It implies an unconventional path or nonconformity in the life of a teenager.