TikTok's latest gross trend began when Liam Weyer, a 19-year-old from Kansas, posted a video of him peeing his shorts on April 21. In the video, Liam is standing in a bathroom while wearing gray shorts. After he said the words "Pee your pants challenge," a stream of liquid seeped through his shorts. A trickle could also be heard hitting the ground. 

There's no mistaking that the teen was actually peeing himself on camera.

Other TikTok users began to follow suit after Liam's original video got hundreds of thousands of views. Interestingly, TikTok removed Liam's original video after it went viral (likely because it toed the line of violating the guidelines), and he had to repost it. 

Some of the users who participated in the Pee Your Pants Challenge posted duets with Liam while they themselves peed their pants. 

Others posted reaction videos to the challenge, and they showed their disgust with it. 

The hashtag for the challenge has been used millions of times, but Liam himself explained that the whole thing was meant to be a joke.