ぴちぴち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)

新鮮(しんせん)な魚(さかな)がピチピチしています。

The fresh fish is jumping around energetically. {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)}

１７歳(じゅうななさい)のその少女(しょうじょ)はピチピチとしている。

That 17-year-old girl is bursting with youth and energy. {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)}

コップの中(なか)で炭酸(たんさん)水(すい)がピチピチと音(おと)を立(た)てています。

The carbonated water is making a crackling sound in the glass. {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)}

太(ふと)ってしまったせいで数(すう)年(ねん)前(まえ)に買(か)ったこのシャツがピチピチだ。

Because I've gained weight, this shirt that I bought a few years ago is now bursting at the seams. {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)}

ピチピチの太(ふと)ももを隠(かく)すべく、私(わたし)はいつもロングスカートを履(は)いている。

In order to hide my thighs, which are bursting with youth and energy, I always wear long skirts. {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)}