The line comes from The Fellowship of the Ring, the 2001 film adaptation of J. R. R. Tolkien's novel, where Gimli the dwarf pledges his axe after Frodo volunteers to carry the Ring to Mordor. In the scene, each member of the new Fellowship offers a weapon or skill, and Gimli's short shout became the most quotable of the pledges. It later spread through reaction videos, gaming clips and soundboards as a shorthand for joining a cause, and it remains popular because the pledge is instantly recognisable even without the full film context.