Why do I hear boss music? refers to a reaction image format, used for signaling at omens and bad premonitions.
The image macro usually features a screenshot from Terraria.
The earliest example of the meme was posted on Steam by user gorbel mcgaffelguts on January 8th, 2019.
The meme, however didn’t become popular until more than a year later, when it emerged on Reddit.
“Why do I hear boss music?” first showed up on the r/dankmemes subreddit on March 14th, 2020, shared by CyrilisArcher, paired with antivax related captions.
Within two days, the meme spread on to the r/Terraria subreddit where it would be posted by users for months, with various humorous captions.
By April, 2019, the meme would be discussed by Twitch and YouTube personalities, such as BeastrollMC and ChippyGaming.