Something that smells very bad.
Stinky things are usually not good and can make people feel sick or unhappy.
Examples:
The garbage is stinky.
I don't like stinky cheese.
The stinky socks are under the bed.
The stinky fish made everyone run away.
The stinky skunk sprayed its stinky smell everywhere.
I don't want to sit next to the stinky boy.