Someone who is sexually attracted to or turned on by the scalp when it is exposed, as from the part in a hairstyle.
Guy #1 Oh, bro, did you SEE that girl with the sexy hair do, she must have had sixteen parts showing all that SCALP!? I just about lost my shit.
Guy #2 Yo, bra, what did you just say? Damn, you're a real live scalp perv!