This is the 4381st most frequent Russian word.
валять
To roll, to tumble, or to felt.
Here, "валять" is used in the idiomatic expression "валять дурака," which means 'to fool around' or 'to waste time without seriousness.'
Он любит валять дурака целыми днями.
He likes to fool around all day.
In this sentence, "валять" means 'to roll (an object),' showing its literal usage.
Кошка валяет игрушку лапами.
The cat is rolling the toy with its paws.
In this context, "валять" means 'to felt' (a material, like wool for crafts), indicating a specific technique in crafting.