Someone who spends all of their time in their parents basement while sitting on their computer and playing popular medieval role playing games such as World of Warcraft or Runescape. They usually have to be over the age of 20 to be considered a true basement wizard, as they are expected to be out on their own at this point, but have become complete failures in life because of their addiction to these pointless games.
hey, I haven't seen Jeffery the Basement Wizard in a few weeks now; did a new expansion for WoW come out recently or something?
by Fergalicious def March 7, 2011