This article contains major plot spoilers! READ AT YOUR OWN RISK!
Diaper Hands is a viral video and meme in Diary of a Wimpy Kid: The Long Haul (film). It came about when Manny was stuck in a slide at Corny's, and Greg had to go into the slide to save him. However, when he tries to find him in the ball pit, he finds a diaper which gets stuck to his hand and starts yelling. People notice Greg and start taking photos/videos which were posted on social media websites, which then goes viral online. As a result, he becomes an outcast, as Greg mentioned. In an scene during the movies credits, Greg meets two girls who take selfies with him, recognizing him as Diaper Hands.