Meaning/Usage: An expression used to indicate you don't believe the other person
Explanation: This is also commonly used as an expression by itself. For example, when someone says something outrageous, you can simply respond with "Whatever!"
Whatever, I know you like him.
You're saying I can't go out tonight with my friends? Whatever!
Whatever! You know I don't believe you.
A.
He told me the window was already broken when he got home.
B.
Whatever, I saw him throw a ball with my own eyes.