The Collaborative International Dictionary of English v.0.48:

Jeer \Jeer\, v. i. [imp. & p. p. Jeered; p. pr. & vb. n.
   Jeering.] [Perh. a corrup. of cheer to salute with cheers,
   taken in an ironical sense; or more prob. fr. D. gekscheren
   to jeer, lit., to shear the fool; gek a fool (see 1st Geck)
   + scheren to shear. See Shear, v.]
   To utter sarcastic or scoffing reflections; to speak with
   mockery or derision; to use taunting language; to scoff; as,
   to jeer at a speaker.
   [1913 Webster]

         But when he saw her toy and gibe and jeer. --Spenser.

   Syn: To sneer; scoff; flout; gibe; mock.
        [1913 Webster]