Which McDonald's slogan debuted globally in 2003?

“I'm Lovin' It” debuted globally as a McDonald's slogan in 2003.

The campaign was created for McDonald's international marketing and used the phrase across advertising, packaging, and other brand communications. Its informal wording was designed to sound conversational and emotionally positive rather than like a traditional product claim.

The campaign is especially associated with the “ba da ba ba ba” musical phrase used in McDonald's advertising. Justin Timberlake appeared in an early campaign-related music video, while Pusha T has been credited with writing the original jingle. The slogan itself remained the central verbal identity.

A common mistake is to treat “I'm Lovin' It” as an American-only slogan. McDonald's introduced it as a global campaign, although executions and supporting advertisements varied by market. It replaced earlier slogans in the company's international brand system.