petrock
nounUK /ˈpɛt rɒk/
US /ˈpɛt rɑːk/
A pet rock is a rock that someone keeps and pretends is a pet.
My little brother carries his petrock everywhere in a little box.
OTHER MEANINGS
2. A fad toy from the 1970s sold in a box with care instructions.
The original petrock came with a funny manual on how to care for it.
3. Something that requires almost no care or attention.
This plant is basically a petrock—you hardly ever need to water it.
4. A person who is very quiet and does not react much.
At parties he just sits there like a petrock.