In conversation, a word that announces one's contempt
for and hostility
toward the person they're about to contradict. Most common on the Internet, for obvious reasons.
Person 1: The first movie I ever
saw in the theater was "Empire Strikes Back." Man, that
for a 6-year-old, so much larger than life. And when Darth Vader said
"Luke, I am your father," I was freaking out. I'll never forget that
Person 2: Um, Vader never said that