ばりばり

Etymology
Probably.

Adjective

 * 1) stiff, rigid
 * 2) energetic, vigorous
 * 1) energetic, vigorous

Adverb

 * 1) stiffly, rigidly
 * : crunchily
 * 1)  energetically, vigorously
 * : with rat-tat-tats
 * : crunchily
 * 1)  energetically, vigorously
 * : with rat-tat-tats
 * : with rat-tat-tats
 * : with rat-tat-tats

Noun

 * 1) state of being or something stiff or rigid
 * 2) state of being energetic; someone having momentum