Is there a word or phrase to describe ambiguous sarcasm?

Question

To be specific, this statement refers to a phrase in which the writer/speaker's intention of being sarcastic is not disclosed to the reader/listener (deliberately or accidentally). The effect strongly depends on the vocal inflection placed on the statement. Is there a better word or phrase than "ambiguous sarcasm"? EDIT: This includes the case in which the speaker is unsure about his or her intentions, leaving the implication of the statement for interpretation.

Answer 1

This sounds related to deadpan delivery of sarcasm, or dry humor, which includes saying something meant to be sarcastic but with a serious tone.

As for your edit, I can't picture not being sure of whether your own intention is to be sarcastic or not, and I don't have a word for the concept.