Goro goro (ごろごろ) is the sound of something heavy rolling — and the word for lazing around at home.
Ask a Japanese friend about their weekend and you might hear it with a happy sigh: うちで ごろごろしました.
What it means
The sound is a heavy, rolling rumble: a big stone rolling down a hill, or thunder far away. Picture yourself rolling from one side of the sofa to the other, and you have the most common meaning: lying around at home, doing nothing much.
How to use it
For lazing around, add します: ごろごろします, ごろごろしました. Put the place in front with で: うちで ごろごろします.

どようびは なにを しますか。
What are you doing on Saturday?

うちで ごろごろします。
Lazing around at home.

いいですね!
Sounds great!
Close cousins
だらだら is lazy too, but in a way you feel a little bad about: working slowly, a meeting that drags on. のんびり is the relaxed, unhurried feeling of a holiday, and it is always positive. ごろごろ is the one where you are actually lying down.
In manga and anime
A cat rubbing against someone makes ゴロゴロ: it is also the sound of purring. And a character flopped on the floor on a day off will often have ごろごろ written next to them.
Can you use it?
Yes, with friends and in everyday talk. It sounds relaxed and a little funny, so it is a nice honest answer to “what did you do at the weekend?”.