Expelliarmus is the Disarming Charm in the Harry Potter books and films, used to force an opponent to drop their wand. One of its most quoted uses is in Harry Potter and the Chamber of Secrets, where Severus Snape demonstrates it during the duelling club and blasts Gilderoy Lockhart backwards. Clips of that moment circulated widely in edits, remixes and reaction videos, and Snape's clipped delivery turned the spell into shorthand for an instant, humiliating defeat that fans still drop into gaming and fan edits today.