The Collaborative International Dictionary of English v.0.48:

Fluster \Flus"ter\, v. t. [imp. & p. p. Flustered; p. pr. &
   vb. n. Flustering.] [Cf. Icel. flaustra to be flustered,
   flaustr a fluster.]
   To make hot and rosy, as with drinking; to heat; hence, to
   throw into agitation and confusion; to confuse; to muddle.
   [1913 Webster]

         His habit or flustering himself daily with claret.
                                                  --Macaulay.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fluster \Flus"ter\, v. i.
   To be in a heat or bustle; to be agitated and confused.
   [1913 Webster]

         The flstering, vainglorious Greeks.      --South.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fluster \Flus"ter\, n.
   Heat or glow, as from drinking; agitation mingled with
   confusion; disorder.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fluster
    n 1: a disposition that is confused or nervous and upset [syn:
         perturbation, fluster]
    v 1: be flustered; behave in a confused manner
    2: cause to be nervous or upset