Solipsism is the notion that the only thing that can be experienced and proven rationally, is the first person experience. As you read this you view it from the filter of idiocy that you normally see everything from, e.g. the first person. It is impossible to refute, and it doesn't mean that a person is narcissistic if they believe in it. Nor does it mean that the person believes they are the only thing that exists, it means that they can rationally believe in only themselves as everything else is beyond their experience, much as i cannot rationally believe in Peru until i visit it, but we're not all perfect.
Here is some solipsism in a jar:
If, then, therefore, shut up.
I enjoy: something i can verify.
You enjoy: not something i can verify.