For full context, there was an event where several YouTubers/Online personalities met the pope. I couldn’t say the specific reason for doing so, but during their visit each of the groups presented a gift. In MatPats case he gave the Pope a copy of Undertale.
Then a lot of people started to clown on MatPat for giving the Pope a copy of Undertale. He made a response defending his gift choice, and honestly it wasn’t that weird of a gift. It’s just funny to me personally because the situation is so low stakes but became a meme because of MatPat’s response.