The Collaborative International Dictionary of English v.0.48:
Gunny \Gun"ny\ (g[u^]n"n[y^]), n., Gunny cloth \Gun"ny
cloth`\(kl[o^]th`; 115). [Hind. go[.n], go[.n][imac], a sack,
A strong, coarse kind of sacking, made from the fibers
(called jute) of two plants of the genus Corchorus (C.
olitorius and C. capsularis), of India. The fiber is also
used in the manufacture of cordage.
Gunny bag or Gunny sack, a sack made of gunny or burlap,
used for coarse commodities. In the southern U. S. similar
sacks are called crocus sack, croker sack, towsack,
and grass sack.
[1913 Webster +PJC]