古惑骚年
[gŭ huò sāo nián]
In Cantonese, 'Gu Wu' means gangster. Combining this with the Chinese word for young person ('骚年', which is a variant form, usually as an Internet slang meaning energetic but slightly troublesome youths), it reflects some rebellion, edginess or mischief in youth. It also suggests the netizen doesn't take everything seriously, even with a touch of playfulness and irony.