The Blackrock Slicer

Source
This item drops from Spirestone Battle Lord in Blackrock Spire.

'The Nicker' Controversy
This axe was originally called The Nicker, presumably for its resemblance to a giant razor blade. After item-linking in trade chat became a meme of sorts for many servers (for the most part, originating with the linking of Thunderfury, Blessed Blade of the Windseeker) people started linking other items. One of these was The Nicker, for the racial innuendo in its name. As a result, it was re-named The Blackrock Slicer.