The Collaborative International Dictionary of English v.0.48:

Drovy \Dro"vy\, a. [AS. dr[=o]f dirty; cf. D. droef, G.
   tr["u]be, Goth. dr[=o]bjan to trouble.]
   Turbid; muddy; filthy. [Obs.] --Chaucer.
   [1913 Webster]