moot
adj.
Subject to debate; arguable: a moot question.
Law. Without legal significance, through having been previously decided or settled.
Of no practical importance; irrelevant.

Sounds sorta close to MU.  That's some rad shit - I gotta ask some of my pals that question about the bus and the pedofiles.  Heh.

Edit: 4 minutes too fucking late!

PS:  Dictionary.com REALLY needs to redo their website.  FUGLY!