The Collaborative International Dictionary of English v.0.48:

Reasty \Reas"ty\ (r[=e]s"t[y^]), a. [Etymol. uncertain.]
   Rusty and rancid; -- applied to salt meat. [Obs. or Prov.
   Eng.] --Tusser. -- Reas"ti*ness (r[=e]s"t[i^]*n[e^]s), n.
   [Obs. or Prov. Eng.]
   [1913 Webster]