クリック：マウスの「左側」のボタンを素早く「一回」プチッと押す事です。

Click: Quickly pushing the mouse's left hand side button once.

そうだ、どうせなら散歩がてらに、林道に行ってプチ森林浴でも・・・。

Right, while we're taking a walk anyway, we could like go along the woodland path and enjoy a little stroll through the forest...

プチッ、と糸を犬歯で噛み切った。

I snapped the thread on my canine.

お金がないので、プチッと旅行。

As I don't have the money, it'll just be a short trip.