1) a single, lone, stray hair follicle growing in a region of skin where no other hair resides. May vary in length.
2) can refer to someone's head of hair if it appears unkemp, perhaps with dead ends or frizz.
1) "Wow, get the tweezers because I need to pluck out this long, squiggly scragglepuss that I found on your shoulder!"
2)"What a scragglepuss, looks like they just rolled out of bed. Maybe they should consider getting a haircut."