Shield-stun shuffling is an advanced technique used to manipulate your fighter’s body positioning while blocking. As the attack strikes the shield, the precise moment the game’s action is minutely frozen in hitstop, flick the control stick in the direction you want to scoot. Your fighter ever so slightly repositions. This technique is difficult to implement, but can be useful in specific situations, allowing you to shuffle out of a multi-hit attack and freeing yourself from shield-stun in order to punish the enemy. Comparable to hitstun shuffling while eating hits.
Super Smash Bros. Ultimate eGuide Ultimate Glossary of Terms and Mechanics