A colloquial communication of agreement. It is essentially deferential in nature.
Doctor - I'm afraid we are going to have to cut out that mole.
Patient - Yeah, right.
Sarcastic agreement, meant to convey disagreement.
"John Kerry is a statesman."
A reply to someone saying sarcastically, "Yeah, right." Instead of getting defensive, this remark is doubally sarcastic. If somebody's being stuck up and thinks they're cool by being sarcastic, saying this will make them reallly mad because they know they've been defeated.
Aimee: Guess what?
Brianna: Chicken butt. No, I lied. What?
Aimee: My basketball team just won the high school championships!
Brianna: Yeah right. (sarcastically)
Aimee: Yeah, right! (enthusiastically) I'm so glad you understand!
Ironic or sarcastic expression of agreement that really means disagreement or dismissal. See whatever
No, Howard Dean is a man of character and conviction . . .