The Collaborative International Dictionary of English v.0.48:

Rackety \Rack"et*y\ (r[a^]k"[e^]t*[y^]), a.
   Making a tumultuous noise.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rackety
    adj 1: uncontrollably noisy [syn: rackety, rip-roaring,
           uproarious]