It means to already have an opinion and made up your mind and are trying to prove what others say is wrong to prove you are right, even if you may not be
What Does Bias Mean In Science?
You have spelled bias correctly. You may be referring to an unreasonable assumption about something.
Bias means being influenced in an unfair way.
When you are bias you are insulting someone or something when it is not obvious like for instant in an news paper article.