The Collaborative International Dictionary of English v.0.48:

Crepitate \Crep"i*tate\ (kr?p"?-t?t), v. i. [imp. & p. p.
   Crepitated (-t?`t?d); p. pr. & vb. n. Crepitating
   (-t?`t?ng).] [L. crepitatus, p. p. of crepitare to crackle,
   v. intensive of crepare to crack. Cf. Crevice.]
   To make a series of small, sharp, rapidly repeated explosions
   or sounds, as salt in fire; to crackle; to snap.
   [1913 Webster]

WordNet (r) 3.0 (2006):

crepitate
    v 1: make a crackling sound; "My Rice Krispies crackled in the
         bowl" [syn: crepitate, crackle]