A small, ugly, or annoying person or creature.
The word 'spug' is not a nice word. It is usually used to say something is not good or not nice.
Examples:
The spug was very small and ugly.
I don't like that spug, it's annoying.
The spug is not a nice person.
The spug tried to steal my candy!
In the forest, there are many spugs, and they are all very ugly.
The spug is so small, it's like a bug.