As you recommended in a comment on the other answer, I searched "slash tutorial" and "makeup slash tutorial". Here are my findings: "slash tutorial": The results are almost all guitar lessons either featuring the guitarist Slash (that's his stage name) or other guitarists teaching you how to play Slash's songs. "makeup slash tutorial": The first result was a woman teaching how to create a look with makeup that was inspired by Slash (the guitarist). The other results were people showing you how to use makeup to make it look like your throat was slashed (slash meaning cut, usually with a knife).

I added your "Makeup slash tutorial" and "Slash tutorial" into Google to see what came up and the results that came up were: Slash meaning a horror film and Slash a famous guitar player from Guns and Roses. There is no main stream use of slash tutorial that I see or have ever heard.