In the clip, which has amassed nearly 14,000 views, Adrian is seen sitting down at his local branch of the Golden Arches after ordering an apple pie and Oreo McFlurry.
The Sydney-based foodie said: "It doesn't matter what kind of McFlurry you get, the hack will still work in the same way."
Adrian is then seen using a spoon to fill the cold McFlurry vanilla ice cream into his piping hot apple pie.
With the warmth of the pastry, the TikToker shows the ice cream starting to melt before he takes a morish bite and continuing until both are finished.
Adrian, who regularly shares must-visit Sydney food spots, said: "Just trust me, it's heaven."
Despite his enthusiasm, some of his loyal followers were unimpressed about the flavour combination and simply penned, "no".
However, many were thrilled with the delectable hack and vowed to try it out for themselves on their next visit.
One said: "YUM I NEED TO TRY" (sic).
Meanwhile in other TikTok news, one woman has divided the internet by sharing her pasta grazing table - and we don't know what we think.
After using kitchen foil to cover her entire table, Karima scooped a huge portion of pasta across the flat surface.
She then loaded the pasta with three different sauce toppings on top, including what appears to be a crazy mushroom sauce, a tomato sauce with slices of chicken and finally a bolognese sauce.
Because the TikToker decided to avoid using containers, all the sources eventually start mingling with each other leaving a very creamy, tomato-y jumble.
Hmmm...this is on TikTok hack we probably won't be trying...