No is a commonplace word used often in the language of English. No is what you say if girls want you to go to the mall with them to shop for clothes all day. It is also what you say when your dad asks you if you want a pony for Christmas, because he's testing you.
The word No came to use from the word oh, which meant that you were rejecting what someone asked or said.
Soon, people would go NNNNNNN!! when they got mad, and they would stomp the ground repeatedly. The N combined with the word oh soon became no and now people use it all the time.