“I'm lovin' it” became McDonald's global advertising slogan in 2003.
The campaign was launched internationally in September 2003 and used the English phrase across markets, often alongside locally adapted advertising. Its branding system included the distinctive “ba da ba ba ba” musical signature, which helped connect television, radio, digital, and in-store promotions.
The slogan followed earlier McDonald's campaigns such as “You Deserve a Break Today” and “Have You Had Your Break Today?” Those older lines are sometimes mistaken for the current global slogan because they were also strongly associated with the company. “I'm lovin' it” was created as a worldwide platform rather than a slogan limited to one national market.