This is when a individual dedicates a period of time to where they subject themselves to the most horrendous thing to their very existence. This activity can be done by many ways including taking a deep dive into a cursed Subreddit or going to the dark side of YouTube. Either way, if the end resulted in the individual being traumatized coming out of a session then they have completed a proper session.
"We told a friend about this cursed video online and he decided that he was going to use it for a Suffer Session."