A sarcastic way of saying sure. Can be used to show doubt to another person.
Mm-hmm can also be followed up with "Sure you do" to show that you really don't believe them.
Guy 1: Hey! I have a girlfriend!
Guy 2: Mm-hmm. Sure you do.
Guy 1: Dude, I'm serious!
Guy 2: Mm-hmm. Sure you are.
This is the act of getting hit by a water bottle and continuing the performance.
1: Did you see how (insert person 3's name) got hit by that water bottle in that talent show?
2: He just kept singing!
1: He really pulled a Bieber on that!
n. An Illuminati follower or believer. Usually detectable by their forehead. They draw an eye on their foreheads to show that they truly believe in the Illuminati.
Mike: Oh god, here comes Victor.
Zeke: He's just wandering around with a fake eye on his forehead.
Mike: What an illuminatist.