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Bah-duh-bah-bah-Nah! — Fast-foodies are not lovin’ this. 

Frozen bricks of presumed pork, reheated store-bought cookies and grease-caked griddles are just a few of the antiheroes features in the “nauseating,” yet trending TikTok series “How McDonald’s food works.”

“I got diarrhea just from watching this,” a repulsed commenter confessed in response to McDonald’s kitchen staffer Isaiah Gilley’s viral video on how the behemoth burger brand prepares its seasonal McRib sandwich. 

The clip, which has stockpiled a staggering 5.7 million views, follows Gilley as he grabs two iced, rectangular patties out of a deep freezer and tosses them into a meat-press cooking device labeled “McRib Clam,” which is set to a 146-second timer.

Gilley then plops a pair of oval buns into a conveyer belt toaster for warming. Once toasted, he reaches into tubs of pre-sliced topping and dumps small handfuls of onions and pickles onto the bread that’s been placed inside a McRib to-go box. 

Pivoting back to the meat, Gilley yanks two cooked patties out of a warming drawer (it’s unclear whether these are the same patties he initially pressed in the “Clam” at the top of the video), pulls open an adjacent warming drawer filled with barbecue sauce and drowns the meat in the condiment vat.

He then drops the slathered chow onto the bun, closes and flips the box — causing the bottom bun to fall into its rightful place on the sandwich without Gilley having to touch the food with his hands — and gives his creation a cheeky thumbs-up as TikTok’s voiceover feature sarcastically says “Your favorite food.”

And viewers were not shy about blasting Mickey D’s for its less than appetizing meal prep.  

“I have never had a mcrib in my life. After watching this video I am thanking my lucky stars,” said a sickened cyber critic. Other unsavory comments like “McGross” and “that looks nauseating” followed behind. And one apparent McRib buff was stunned to learn that the heralded hoagie isn’t served up fresh off the grill. 

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“Wait…! So it’s not made to order, flame grilled over a wood burnin BBQ pit, smothered with Texas tangy BBQ sauce & grilled onions??!!,” the shocked watcher wrote, emphasizing their dismay with the mind-blown emoji. 

In equally popular clips, Gilley also unveiled the stomach-turning truth behind McDonald’s beloved baked goods, mainly their soft-baked, chewy chocolate chip cookies and warm baked apple pies.  

A clip that has amassed over 512,000 views shows him grabbing a handful of cookies out of a plastic grocery-store container, laying them on a stained parchment paper atop a baking sheet and placing them in the microwave oven for two minutes. 

“And here I am thinking I got the fresh s- -ts when I get them warm,” a deflated cookie lover commented — heartbroken by the realization that an army of little old McGrandmas hasn’t been hired to churn out the sweet treats in the fast food chain’s over 36,000 worldwide locations. 

Apple pie #mcdonalds #mcdonaldssecrets #foryourpage #xyzbca #fyp #TheHarderTheyFall #applepie #food #fastfood

And Gilley’s video on the way Mickey D’s chefs up its ooey-gooey apple pies — snatching a grip of the frozen pastries out of a cardboard box in the freezer and nuking them for 10 minutes — sent social media scolding the eatery for its funky food prep.  

McDonald’s did not immediately respond to The Post’s request for comment.