San Diego, California - Yuck, that certainly doesn't belong in a McFlurry! A young woman is grossing out viewers on TikTok with a nasty discovery she found in her McDonald's dessert – only after chewing it up!

Alexa Carcione recently shared her disgusting fast food experience on TikTok and scored a viral hit with more than 208,000 views and 22,000 likes in just four days.

In her McFlurry video, the Carcione starts off by happily holding her sundae up to the camera and also films in from the top at one point to show that it's mostly vanilla soft serve ice cream and tiny pieces of Oreo cookies inside.

"Mainly" is the key word, because there was also another unwanted ingredient hiding in the sweet mixture: Alexa discovered a cockroach in her McFlurry!

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She figured out the disgusting secret ingredient only after biting down on the mouthful of ice-cream, as she explained in her clip.

Carcione described the strange sensation: "When you're just enjoying your Oreo McFlurry and then all of a sudden you feel a crunch... surprise: it's a cockroach," she captioned the video.

She immediately spat out the unwelcome guest in her mouth and it landed on her bedspread.

Below the video, Alexa wrote "I am NOT lovin' it" with a vomit emoj - in reference to the McDonald's motto "I'm lovin' it".

She also added, "You better not eat at McDonald's unless you like cockroaches!"

Alexa shared that she notified the manager of the franchise located near San Diego State University.

His response, however, was a just one dry sentence: "Thank you for reporting it to us". She did not receive an apology or money back for her McFlurry, she said.

"It felt as if I had chewed on the shell of a shrimp," said a traumatized Alexa. She probably won't order anything from McDonald's ever again!