We all know already how much Japanese love to shorten long words, and well, Makudonarudo is a perfect example of simply too long of a word. Therefore, of course, there is a shortened way to say it.

In Tokyo and the surrounding areas in Kanto, McDonald's is shortened to:

maku

However, in Osaka and it's surrounding areas, McDonald's is shortened to:

makudo

Just another silly example of differences between dialects.