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(Similar to McBender, McABender and Fassavoy)

1. The portmanteau couple name for the James McAvoy and Michael Fassbender RPS pairing.

2. Fandom involving the two actors James McAvoy and Michael Fassbender.

3. A good example of bromance that has spread like a wildfire after the newest X-Men-movie "X-Men First Class" where the two actors played Professor X(McAvoy) and Magneto(Fassbender) together.

4. Also claimed to be a lifestyle cultivated by fangirls of the McFassy Bromance.
TumblrFangirl 1: OMG I just saw "X-Men FC" for the third time!! McFassy never gets old!!!<333

TumblrFangirl 2: Keep calm and ship McFassy!<3
by McFassyGirl July 17, 2011
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