A combination of Mace Windu and Dude!
It is a word that guys who are good friends (bros) can use to refer to one another. It can be used at basically any time. It does not have to be used in a Star Wars context, although it helps if all the bros are familiar with the Star Wars movies.
Guy1: Hey, whats up Mace Windude?
Guy2: Nothin much, bro, just gunna watch Star Wars Saturday on Spike TV today.
Guy1: Whoa brah, me too.
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Chuck Norris: I am looking for my long-lost brother, can you help me?
Yoda: Mace Windu, most badass Jedi in the order, he is.
Chuck Norris: Mace, are you my brother
Mace Windu: YOU BETTER FUCKING BELIEVE IT!!!!
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The baddest motherfucker in the entire galaxy. This motherfucker is an even more powerful than Yoda, who has 800 years of experience. Mace Muthafuckin Windu is the only Jedi badass enough to carry a purple lightsaber. In addition to being a Jedi Master, Mace "Sam Jackson" Windu is also the most notorius/legendary pimp in all the galaxy. Although it has not been confirmed, Mace Windu is rumored to have a wallet that reads "Bad Motherfucker". Unfortunately, Mace Windu was killed by that little bitch Anakin Skywalker and that pedophile Palpatine.
Ex 1: Mace Windu is one bad motherfucker.
Ex 2: Mace Windu: (referring to Anakin) The force is strong with this muthafucka.
Ex 3: Mace Windu: What does Yoda look like?!
Palpatine: What?!
Mace Windu:What does master Yoda look like?!
Palpatine: Um... he's short... and green...
Mace Windu: Does he look like a bitch?!
Palpatine: What?!
Mace Windu: Does Master Yoda Look like a bitch?!
Palpatine: What?!
Mace Windu: Say what again, I dare you, I double dare you!
Does Master Yoda look like a bitch?!
Palpatine: No
Mace Windu: Then why are you trying to fuck him like a bitch?!
Ex 3: (after disarming Jango Fett on Geonosis)
Mace Windu: There's a little passage I got memorized, Ezekiel 25:17: The path of the righteous man is beset on all sides by the iniquities of the selfish and the tyranny of evil men. Blessed is he who shepherds the weak through the valley of shadow, for he is truly his brother's keeper and a finder of lost souls. And I will strike down with great and furious anger those who would attempt to poison my brothers, AND YOU WILL KNOW MY NAME IS MACE MUTHAFUCKIN WINDU WHEN I LAY MY VENGEANCE DOWN UPON THEE!!! (cuts Jango's head off).
Ex 4: I'VE HAD IT WITH THESE MUTHAFUCKIN SITH ON THIS MUTHAFUCKIN STARSHIP?!
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Swirling a used condom around one's head in the style of a medievil mace before releasing it in the direction of the target
This knight was coming at me with his mace, so i wipped out my johnny and gave him my dirty mace
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The terrible smell from one's private parts.
I went down on that girl, but i got blinded by her awful croch mace.
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Announcing that you intend to do something but then pull out at the last minute much to the annoyance of everyone involved.
Person 1: Hey, would you like to move in with me?
Person 2: Of course.
Day before moving in-
Person 2: Oh I can't move in, i'm a complete bastard.
Person 1: 'Doing a Mace' I see, no more being alive for you!
(Person 2 is beating to death with a hammer as Person 1 is very annoyed)