The Collaborative International Dictionary of English v.0.48:

Buzz \Buzz\ (b[u^]z), v. i. [imp. & p. p. Buzzed (b[u^]zd); p.
   pr. & vb. n. Buzzing.] [An onomatop[oe]ia.]
   To make a low, continuous, humming or sibilant sound, like
   that made by bees with their wings. Hence: To utter a
   murmuring sound; to speak with a low, humming voice.
   [1913 Webster]

         Like a wasp is buzzed, and stung him.    --Longfellow.
   [1913 Webster]

         However these disturbers of our peace
         Buzz in the people's ears.               --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

buzzing
    adj 1: noisy like the sound of a bee; "the room was abuzz over
           the latest scandal" [syn: abuzz, buzzing]