It's a Somali term for coarse hair. The invert of Jileec (Soft hair). Somalis vary in hair texture from Afro to Curly/Wavy these terms are applied to an individual Somali as a nickname . Jareer is also applied to Africans largely of West African & Bantu descent generally , just like Jileec is applied people of South Asian descent .

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

awesomeness and all amazing things that are in existance, all in one being