Katy Perry's latest track 'Swish Swish' is believed to be an attack on Taylor Swift, the latest move in the pair's years-long feud.
It's a direct response to Swift's 'Bad Blood', according to multiple reports; although neither woman has explicitly confirmed the other is the target of their respective tracks.
"Your game is tired, you should retire," sings Perry in her new song.
"You're 'bout cute as an old coupon expired. And karma's not a liar - she keeps receipts."
The lyrics also claim their "calculated" target will be made to "kiss the ring".
Amongst the social media chatter around 'Swish Swish' is Swift's friend Ruby Rose, the Australian model and actress.
She hit out at the song as a "sloppy mess", "mean spirited" and "purposeful poop", adding it was a "bummer" that Perry had gone "low".
Rose also suggested Perry isn't successful, chiding her fans for tweeting rather than buying albums so the 'Firework' hitmaker would "finally chart".
'Swish Swish' features Nicki Minaj, whose rivalry with Swift has been far less cryptic than Perry's. The 'Anaconda' hitmaker is also believed to direct some of her salty lyrics in the collaboration at Remy Ma, another nemesis.