This is a silly article.
The content of this article is not part of official Warcraft lore, but has nevertheless become part of the World of Warcraft culture or community.

Thrall and his balls.
(Disclaimer: May not be Thrall's actual balls.)

Thrall's balls is a humorous catch phrase originally used by Legionnaire Nazgrim during H [30-35] Blood and Thunder!, during which he yells: Thrall's balls! They're everywhere...

Later, during H [30-35] Defending the Rift, he also says Thrall's balls! I'm sick of fighting naga!

Following patch 7.0.3, orc characters who use the /whoa emote say "Thrall's balls!"