The global McDonald's slogan introduced in 2003 was “I'm Lovin' It.”
McDonald's launched the campaign in 2003 as a major international branding platform. The slogan used an informal, conversational phrase intended to connect the food and restaurant experience with upbeat enjoyment. Its short wording also made it adaptable across markets and media.
The campaign is associated with the “ba da ba ba ba” musical hook, which became a prominent part of McDonald's advertising. The slogan is often discussed alongside the question of who created or performed parts of the campaign, but the central branding fact is its 2003 introduction for McDonald's.
It replaced older, country-specific or era-specific taglines in many markets without eliminating all local advertising variations. Because McDonald's has used different slogans at different times, “I'm Lovin' It” is best understood as the chain's major global platform rather than its only slogan ever.