irony
[ahy-ruh-nee, ahy-er-]
noun, plural i·ro·nies.
the use of words to convey a meaning that is the opposite of its literal meaning: *the irony of her reply, “How nice!” when I said I had to work all weekend.
http://www.dictionary.com/browse/irony
I only mention this because you seem to be completely unfamiliar with the concept.