The phrase "youthful indiscretion" refers to a mistake or misbehavior committed by someone when they were young or in their teenage years. It suggests that the action was a result of immaturity or inexperience. Full definition
Whenever an MP is embroiled in a sex scandal or tales of youthful indiscretions there are those of us who loyally stand up and point out that politicians» personal lives are irrelevant. (politics.co.uk)
However, if you get past the screening interview and have credible explanations about youthful indiscretion or other mitigating circumstances which you disclose at an appropriate time, you may get the job. (lawyerist.com)
Identity theft, libel, defamation, mistaken identity, and youthful indiscretions captured forever — these are just a few of the things that can come back to bite you. (entrepreneur.com)