David Bowie's son has posted a cryptic tweet appearing to poke fun at Lady Gaga following her tribute to his late father at the Grammy Awards.
Duncan Jones posted the Oxford English Dictionary's definition for the word "gaga" on Twitter during last night's ceremony, after the 29-year-old star performed nine of the late musician's hits in a stunning six-minute performance.
Bowie's son tweeted: "overexcited or irrational, typically as a result of infatuation or excessive enthusiasm; mentally confused." Damn it! What IS that word!?"
While the meaning of Duncan's tweet is not entirely clear, the message has sparked speculation from the Twittersphere that he wasn't impressed with Gaga's tribute to his late father, who died of cancer aged 69 last month.