The Collaborative International Dictionary of English v.0.48:

Poke \Poke\, n.
   1. The act of poking; a thrust; a jog; as, a poke in the
      ribs. --Ld. Lytton.
      [1913 Webster]

   2. A lazy person; a dawdler; also, a stupid or uninteresting
      person. [Slang, U.S.] --Bartlett.
      [1913 Webster]

   3. A contrivance to prevent an animal from leaping or
      breaking through fences. It consists of a yoke with a pole
      inserted, pointed forward. [U.S.]
      [1913 Webster]

   Poke bonnet, a bonnet with a straight, projecting front.
      [1913 Webster]

WordNet (r) 3.0 (2006):

poke bonnet
    n 1: a hat tied under the chin [syn: bonnet, poke bonnet]