Tā niánqīng shí shì jiētóu hùnhun, hòulái gǎiguò-zìxīn, kāi le yì jiā xiǎo fànguǎn.
He was a street punk when he was young, but he later turned over a new leaf and opened a small restaurant.
Tips
usage
混 means to drift or muddle along, as in 混日子 (to idle one's days away), so a 混混 is someone who hangs around without proper work and causes petty trouble. 小混混 is even more dismissive; 流氓 is a stronger word.
