Cube Nut
Someone who obseses over Rubiks cubes or any of its varients including 4x4x4, 5x5x5, V cube 6, V cube 7, Megaminxs, Gigaminxs, etc.
Kaelan "I am such a cube nut"
Kira "I can tell, you solved that megaminx in two minutes"
Kira "I can tell, you solved that megaminx in two minutes"