What is McDonald's slogan?

Online Answer
I'm Lovin' ItTied around the slogan "I'm Lovin' It," the advertising blitz marked, surprisingly, the first time the venerable fast-food company had ever used a single message and set of commercials worldwide at the same time.
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The appeal of "i'm lovin' it" spoke to the simple pleasures of everyday living in which McDonald's had a role to play. It reminded everyone that McDonald's was part of their lives and their culture and that McDonald's overall experience was one of warmth and a real slice of everyday life.