Definition:
“A way of using words that are the opposite of what you mean in order to be unpleasant to someone or to make fun of them.”
"sarcasm noun." Oxford Learner's Dictionary, Oxford University Press, www.oxfordlearnersdictionaries.com/us/definition/american_english/sarcasm. Accessed 31 Aug. 2022.
Informal:
A method of comedy where you say the opposite of what you mean in order to make fun of something, often something obvious. Example: If someone says something obvious, a common sarcastic response is, “Wow you really connected the dots on that one, Sherlock.”
Etymology:
-The origin of the word sarcasm dates back to the Ancient Latin word sarcasmus, which stems from the Greek word sarkasmos, meaning "a sneer, jest, taunt, mockery”. This word’s root is another Greek word sarkazein "to speak bitterly, sneer."
"sarcasm (n.)." Online Etymology Dictionary, Douglas Harper, 29 Dec. 2021,
www.etymonline.com/word/sarcasm.