The act of shoving your testicles into the anus of a girl you are having vaginal intercourse with in the missionary position.

May also include shoving your testicles into the vagina while having anal sex.

Akin to an "Armstrong".
"Dude, I was doing this chick and I totally MacMillan'd her. Right in the backseat of my Miata!"
by TroubledIndividual March 26, 2009
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The reason to be afraid of what is not there.
people cut thier grass to make sure Capt. MacMillan isn't there.
by Brigs16 December 08, 2008
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One of the coolest snipers on any game, could possibly shoot an enemy in the head at 1,000 yards, also has one of the best scottish accents on a game, despite being a crack-shot with a sniper, it's Price who "assasinates" Zahkaev (he blows off his arm)
"Too much radiation, we'll havta go arown"-Cpt. MacMillan
by Iameverywhereyetno-whereatall October 18, 2009
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A Scottish Sniper From the Game Call of Duty 4. He is Lt. Price's Captain for the missions: 'All Ghillied Up' and 'One Shot, One Kill'
"Oi, Suzy!" - Cpt. MacMillan
by "Soap" Mactavish July 31, 2008
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A really hot Scottish man. His first movie was miss peregrine's home for peculiar children, he played Enoch O'Connor. He was also in River City as Mark Walker and Dale Jackson on Waterloo Road.
Person1: wow that Enoch O'Connor has a sexy accent

Person2: oh that's Finlay MacMillan, if you wanna hear more of his accent then you should watch Waterloo Road and River City.
by A Scottish fan January 18, 2017
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Aside from Gaz he is the best character in Modern Warfare 2. He appers twice in the game when Cpt. Price is having a flashback of 15 years ago. All Ghillied-Up and One Shot, One Kill are the missions in which you play as Price.
Cpt. Macmillan quotes:
"Shite! Where did he come from?"
"Pooch doesn't look too friendly."
"Are you daft?"
"The word stealth doesn't mean much to you does it?"
by A7X forever September 06, 2010
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