bubblingly; foamingly; sinking or rising while giving off bubbles
cute and chubby; pudgy; puffed up
bulging; swelling (e.g. with water); loose-fitting or baggy (clothing)
水がぷくぷく泡立っている。
The water is bubbling.
ぷくぷく太った猫がかわいい。
The chubby cat is cute.
ぷくぷくと泡が出てきた。
Bubbles came up.