ばんばん

Adverb

 * 1)  enough, to the full amount, to the fullest degree
 * 2)  entirely not - with a denial word(ない, ず)

Etymology 2
Onomatopoeia.

Adverb

 * 1)  sound of a gun firing, bang bang
 * 2) doing something at a fast pace
 * 3) in succession, one after another