The Collaborative International Dictionary of English v.0.48:

ballyhoo \bal"ly*hoo\ v. t. [imp. & p. p. ballyhooed; p. pr. &
   vb. n. ballyhooing.]
   to advertize or publicize noisily or blatantly.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

ballyhoo \bal"ly*hoo\ n.
   noisy or blatant advertizing or publicity.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

ballyhoo
    n 1: blatant or sensational promotion [syn: ballyhoo,
         hoopla, hype, plug]
    v 1: advertize noisily or blatantly