SKinny in Hamer terms? Or Skinny in guitars in general?
I am the "mostly skinny" guitar neck guy. Wizard thin no way, too much, first gen Charvels and Jackson's, usually too thin too though I've come across a few that were fatter (and one mid 80's Jackson Tele I SHOULD HAVE KEPT).
I measure to define, nut width, 1st and 12th frets at a minimum. I have an entire catalog of necks I've measured over time. I'll note the profile type too, soft V, D, etc. if it's of interest. This is how I figured out what guitars I could play without straining my dinged up and rebuilt left arm.
My '81 Special is thin and about the limit of how small I can go. The eye is in the beholder, but science and maths don't lie; Be Nice, Measure Twice!