The title "What's the Worst Decision You Made as a Teenager?" is a common and popular theme for discussion on Reddit, especially in subreddits like r/AskReddit, r/AskOldPeople, or others where people share life experiences.

While I can't pinpoint a single definitive podcast with that exact title and a specific episode, this topic is frequently covered in the genre of "Reddit Story" podcasts (where narrators read and comment on popular Reddit threads).

A podcast channel that often features Reddit stories covering topics like this is "Am I the Genius?" (formerly Am I the Jerk?). They have episodes with similar themes, such as:

"What is the Worst PERMANENT Life Decision that You've Ever Made? - Reddit Podcast"

Other threads on Reddit about teenage mistakes, regrets, or "dumbest things you did" are commonly turned into content by various creators.

If you are looking for a specific episode, I'd recommend searching on YouTube or popular podcast platforms for the phrase along with the name of a known Reddit story podcast.