Late 16th century; earliest use found in Richard Hooker (1554–1600), theologian and philosopher. Either from overabound + -ing, or from over- + abounding.
Definition of overabounding in US English:
overabounding
adjectiveˌəʊv(ə)rəˈbaʊndɪŋ
Greatly or excessively abundant.
Origin
Late 16th century; earliest use found in Richard Hooker (1554–1600), theologian and philosopher. Either from overabound + -ing, or from over- + abounding.