Akkadian

zabābu - to be in a frenzy, to act crazily (CAD Z 1)

Considered a hapax in CAD Z 1; in AHw. 1065 united with ṣbb ‘(um)flattern’. This semantic and phonetic ambiguity is, however, irrelevant in view of the widespread SB derivative zabbu ‘a type of extatic’ recognized by both CAD Z 7 and AHw. 1501.

PS
*ḏbb - to be mad, crazy (SED I No. 13ᵥ, DRS 326)
Scarce attestation: Akk. and Arb. only.