in order to keep my blood pressure down and my chest pains to a minimum, all i have to say today is ~
"Whatever" is a slang term meaning "Whatever you say." The term is also used to dismiss a previous statement and express indifference. It is sometimes only written as w/e, where the / indicates the beginning of the second word.
In the late 20th century and early 21st century, the word became a sentence in its own right; in effect an interjection, it is used as a powerful conversational blocking tool.  In the above examples, the first speaker is left without a convincing retort. Anything they do or say can simply be blocked by the retort of "whatever".
On the TV show All in the Family which premiered in 1971, 'whatever' was frequently used by the main character, Archie Bunker, as a dismissive response to his wife, Edith Bunker.
It was prevalent among the affluent "valley girls" of California in the 1980s, is known to be offensive as in saying "I don't think what you are saying is relevant" (Clueless), according to slang expert Tony Thorne, who first recorded it there. It was a term used by WAGs - the wives and girlfriends of movie stars and producers but picked up as part of the code of the 'valley girls'.