An onomatopoeia for small bubbles or repeated bubbling/foaming; describes something rising or sinking while emitting little bubbles.
鍋の中で小さな泡がぷくぷくと出てきた。
Small bubbles started bubbling up in the pot.
池の底で何かが動き、泥がぷくぷくと揺れた。
Something moved at the bottom of the pond and the mud bubbled up.
子どもが風呂でぷくぷくと遊んでいる。
The child is playfully making bubbles in the bath.
Describes something cute and chubby or puffed up (e.g., cheeks); a mimic/onomatopoeic word for plumpness.
赤ちゃんの頬がぷくぷくしていて触りたくなる。
The baby's cheeks are plump and make you want to touch them.
パンが焼けて中がぷくぷくと膨らんだ。
The bread baked and puffed up inside.
寒さで頬がぷくぷくに冷たくなった。
My cheeks got plumply cold from the chill.