Ligma is a fictional disease invented purely as a bait and switch joke, spreading widely online in 2018 through gaming streams and social posts. The setup tricks someone into asking what Ligma is, leading to a crude pun punchline. The doctor version reframes that exchange as a medical consultation, which became a popular format for short skits and reposted meme clips. Its staying power comes from how easily the script adapts to new voices and scenarios while the reveal stays instantly recognizable to anyone who has heard the prank before.