When somebody with longer
hair (extending an inch or more past the ears) has a good bunch of flat laying
hair posed directly in front of the ears, while still keeping the ears visible, near fully peaking out through the hairs color.
This resembles the side of a chimpanzees face, not a
monkey, but colloquially.. who the hell cares.
This effect is particularly noticeable on lighter skinned
people with darker hair colors, as their ear and hair more objectively match the look of a chimpanzees side profile.
Although if somebody is not in that category, the effect is still easy to spot!