In a Pickup Slide, Link will move extremely slowly while ignoring all collisions other than basic ground checking, allowing Link to travel through most walls as long as there is ground beneath them. Unfortunately, because the slide speed is so slow, it can take hours of the game running to just get through a relatively thin gate or wall.
To execute a Pickup Slide, Link is required to collect something that prompts the animation of Link turning around to show the item to the camera. You can achieve this by various methods such as rolling into a rupee, picking up a rupee with the Boomerang, or opening a chest. Depending on various factors not yet fully understood (see Notes below), Link may start very slowly sliding in a random direction, clipping any wall or object in his path. The slide will cancel as soon as the text box is closed.
The reason Pickup Slides work is that during the animation of showing the item to the camera, Link sways back and forth slightly, but there appears to be a missing frame that would otherwise make the animation a perfect loop. Because of this missing frame, Link moves a miniscule amount in some direction every cycle.
Low% uses Pickup Slides to skip some items, but the technique otherwise has no uses in speedruns at present due to how long it takes to perform. For example, Low% uses a Pickup Slide can skip all four Poes in Arbiter’s Grounds by bringing a pot that contains a blue rupee over to the gate that separates the two halves of the dungeon and using the blue rupee text to skip through the gate. This Pickup Slide takes about 10 hours. Another use is clipping through the wall in the first room of Sacred Grove that normally requires Wolf Link to howl at the stone to remove: It is possible to bonk into the tree in the center of the room, and if a blue rupee falls, use the rupee for a Pickup Slide through the wall.