What is the slang for whatever?

What is the slang for whatever?

Whatever is a slang term meaning "whatever you say" , "I don't care what you say" or "what will be will be". The term is used either to dismiss a previous statement and express indifference or in affirmation of a previous statement as "whatever will be will be".

Is it rude to say whatever?

Yes, it's rude. "Whatever" expresses indifference; often, expressing indifference is dismissive, and in this case, it's dismissive of what the other person has to say. Since "whatever" can express indifference without being dismissive, it's not rude in all situations.