An object that's described as chunky is thick and solid, not thin or delicate. Think of a big, heavy chain as an example of something chunky.
You might hear people say that their new boots are really chunky, which means they have thick soles and a lot of weight to them - perfect for walking in rough terrain. You can also talk about chunky jewelry, like a big, bulky necklace or some chunky earrings that make a statement. Sometimes, food gets described as chunky too, especially if it's got lots of big pieces or chunks in it, like a hearty stew with plenty of vegetables.
Having chunks.
Example: I ate a chunky bar of chocolate.
