How did the Nazis figure out whether a person or community is 'Aryan' or not?

Nazi racism was not actually scientific, it was just a load of bullshit with a thin patina of “science-y” garwharbl to justify what was basically a totally ideological belief.

And then we get sexy time with them!

Poles are “ugly, subhuman Slavs” but hey, Hermann, have you noticed how hot and blond those leggy Polish chicks look? They don’t fit our “subhuman” model at all! İn fact, they kind of look like our Aryan ideal personified!

How can I get the lead guitar removed from a song so I can play the lead Guitar parts myself and have the rest of the band's music playing? Is there ought to be a website or company who can do this?

And then we get sexy time with them?

Ultimately, what made a group of people “Aryan” or not came down to how much they wanted them to be “Aryan”.

Ja, well, Helmut, it’s very simple. Those hot leggy blondes are actually not Slavs at all but are, in fact, Aryans who got Slavicised. We need to rescue them from the pit of subhumanism that surrounds them by immediately giving them Aryan status!

Adam Scott, nearly 45 years old, with chance to redefine career on U.S. Open Sunday - NBC Sports

It was all bullshit the Nazis made up as they went along. Trying to cast it in real scientific terms is a waste of time.

If the Nazis wanted someone to be “Aryan”, they made up some cock and Bull story to justify it. If they wanted the opposite, they could be equally inventive in assigning someone to “Untermensch” status.

They used their “spidey sense”.

Scientists stunned as heat caught on camera ‘bouncing like sound’ for first time ever - Daily Express US