In Online multiplayer games, where one side clearly has an advantage over the other side due to veteran players ("clueful" players, or players with 'clue' all being on the same team).
Such an imbalance between "newbies" and "clue" players on opposing teams is known as a "cluestack".
Originated on netrek
Holy crap! No wonder our team is losing. Look at the cluestack on the other team!