The sound or manner of liquid dripping drop by drop; trickling or drops falling one by one.
バケツの底から水がポタポタ落ちている。
Water is dripping from the bottom of the bucket.
夜中に壊れた蛇口がポタポタ音を立てて目が覚めた。
I woke up because the broken faucet was making a drip-drip sound.
雨が屋根からポタポタと落ちて、窓に当たる音がする。
Rain is dripping from the roof and you can hear it hit the window.
Wet and heavy (of snow, clay, etc.); moist and dripping in a way that makes things heavy or soggy.
今年の冬はポタポタした雪が多く、枝に積もると折れそうだ。
This winter there's a lot of wet, heavy snow; when it piles on branches they look like they'll break.
雨の後で道の土がポタポタしていて、靴が泥だらけになった。
After the rain the ground was wet and muddy, and my shoes got covered in mud.
(Archaic) a mimetic word for moving slowly or leisurely; now somewhat old-fashioned.
老人は杖を頼りにポタポタと歩いた。（やや古風な表現）
The old man walked slowly, leaning on his cane. (a somewhat old-fashioned expression)