I'm not being literal here.

Razor blades are utilized by drug users to separate drug powders into fine lines for snorting. Since we are talking about coke and MDA, I believe that's what the text is referring too. It would be unlikely for it to be talking about a video editing tool such as the Razor tool in various softwares.

The "editing" mentioned probably just means that it was in this scenario that Be Pop came to be. I don't believe it's anything literal.

Alternatives are "navalhas" e "gilete" (though I don't recommend using this last one). You could also call it a "placa" or "cartão" of any kind, as a credit card would do the trick just fine, and can even be seen in many examples.