It comes after he referred to her and boyfriend Tom Clare as “Shrek and Donkey” when they posted a loved-up snap.
She quickly hit back branding him “Lord Farquard” referring to the curtain-haired villain of the Shrek movies.
And it seemed she wasn’t done with him sharing a video of him watching a conversation between her and Tom.
It was captioned: “Your two smartest friends are talking and you’re just there acting like you understand what they’re saying and nodding at the end.”
As if to ram the point home, the video showed a series of question marks spinning over Casey’s head.
Samie, 22, wrote: “Screaming” along with two laughing-face emojis, adding: “@CaseyOGorman you doughnut.”
While Casey is single, after splitting from Rosie after their appearance at the Love Island Reunion, Samie and Tom, 23, have made their romance official.
She shared a video of them in the back of a taxi, writing: “This is my BOYFRIEND everyone” along with a love-heart emoji.
Hours before she declared they were an item, the pair were pictured in a fancy London restaurant, with her clutching a cocktail.
Samie captioned the snap: “My favourite place with my favourite person❤️.”
Both Samie and Tom entered this year’s winter series of Love Island as bombshells and, after coupling up, made it to the final.
They finished third, behind runners-up Ron Hall and Lana Jenkins. This year’s series was won by Kai Fagan and Sanam Harrinanan.