Agroof, Agrufe, Agruif

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Agroof, Agrufe, or Agruif [uh-gruef]
adverb

Definition:
To fall flat on one's face, or to be face downwards and prone.

Etymology:
From the Norse, á grúfu, 'face-down' or 'on the belly'.

Usage:
My roommate has absolutely no coordination skills and is often found agroof, moaning piteously.

Extra info:
This word is obscure, but I find it quite awesome that there is a single word that represents a rather common phrase. Cue the roommate commenting about how much she dislikes me in 3, 2, 1...