bursting with youth and energy (esp. young woman); vivaciously young; spunky; energetic
(fish) jumping around energetically (e.g. when caught in a net)
bursting (e.g. seams); tight
splattering (e.g. cooking oil)
彼女はぴちぴちの若さだ。
She's bursting with youth.
ぴちぴちした魚を釣った。
I caught a lively fish.
ぴちぴちの新入社員が入った。
A spunky new employee joined.