Which McDonald's slogan began its worldwide rollout in 2003?

I'm Lovin' It began its worldwide rollout as a McDonald's slogan in 2003.

The campaign was designed as a global brand platform and used the phrase in advertising, packaging, and restaurant communications. Its casual first-person wording was intended to sound like a customer's enthusiastic response rather than a formal corporate claim.

The launch included a song and advertising featuring Justin Timberlake, while the campaign's creative development involved the German agency Heye & Partner and the international agency network DDB. The rollout helped McDonald's use one recognizable line across many markets while allowing local advertisements to vary.

A common mix-up is treating the phrase as an older McDonald's slogan because the company had used many memorable campaigns before it. In fact, it belongs to the early twenty-first century. The phrase also uses the informal contraction “I'm,” a deliberate choice that gives the slogan a conversational tone.