Nikki uploaded the dramatic tale on her TikTok account @stressymessydepressymama and warned people to never get inked with their best friend.
She was responding to a video by another user who asked: “What’s a mistake you learned the hard way that you can now help others avoid?
“Don’t get matching tattoos with your best friend, it’s only cool until…”
Nikki then adds: “…Until she has an affair with your husband, takes over your entire life, and starts raising your children as if they’re her own.”
“So much therapy though, really so much f***ing therapy,” she adds drily.
Unsurprisingly, the shocking video has been watched more than 1 million times, with 195,000 “likes” and thousands of people commenting with questions about the story.
One person asked how long they had been friends for, another questioned how long her marriage had lasted, and others wanted to know more about the design of the BFF tattoo.
In another video, Nikki says they were best friends for 11 or 12 years and did everything together in the small town where they lived, including lunch dates and gym classes together.
She also revealed the tattoo on her ankle, which had read, “You keep me wild”, above the Morse code dots for “best friends forever”.
Nikka says the trouble started brewing when her husband asked to move into an open relationship.
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Although she says she agreed to do this, she stressed she had set up rules including “no friends” – so was horrified to find her husband and pal drunkenly kissing on the sofa at a Halloween party.
Even worse, she claims they wouldn’t stop when she asked them to.
A sympathetic viewer told her: “Girl, you deserve so much better.”
Someone else joked: “She said same tattoo same life.”