The definition of ring-a-ding is an extremely exciting person, thing or activity.
An example of a ring-a-ding activity is sky diving.
See ring-a-ding in Webster's New World College Dictionary
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adjective
Origin: echoic
noun
Browse entries near ring-a-ding
rim
rinderpest
rind
Rinehart
rinforzando
ring-a-levio
ring-billed gull
ring-bill
ring buoy
ring finger