请原谅我一时年少轻狂
[qĭng yuán liàng wŏ yī shí nián shăo qīng kuáng]
'Please forgive me for my arrogance when I am young.' It implies the regret over the actions or words one may have done out of youth arrogance. The user probably used to do something improper because of youthful recklessness and hoped to gain others' forgiveness