Lady Gaga performed a medley of David Bowie songs at Monday's Grammy Awards in tribute to the iconic musician, who died Jan. 10. We thought it was the best performance of the night, but David Bowie's son, Duncan Jones, would disagree with us. Shortly after the performance, he tweeted: "overexcited or irrational, typically as a result of infatuation or excessive enthusiasm; mentally confused.' Damn it! What IS that word!?"

"overexcited or irrational, typically as a result of infatuation or excessive enthusiasm; mentally confused." Damn it! What IS that word!?

— Duncan Jones (@ManMadeMoon) February 16, 2016

To figure out what was on the tip of the movie director's tongue, one would have had to go to the Oxford English Dictionary and find that this is the definition of the word "gaga."

Lady Gaga pays interstellar tribute to David Bowie

Seems like someone thinks someone else's fandom got in the way of their judgment!

Watch Gaga's performance below.