The word refers to someone who has above average qualities. It's a way of complementing a person on his or her unpretentious character, whilst he or she is achieving life's goals in a phenomenal way.
person A: "Shiiiit son, she is SO Jumoke!"
person B: "Right on brotha, truly sublime. Her man gotsta be the most fortunate brother up in here."
This word refers to someone who is a waste cadet of un-proportionate amounts. They tend to listen to shit music and hunt after black men with high-top heads.
Person 1: Who is that girl getting up on that guy with a high-top?
Person 2: Oh that must be a Jumoke!
Person 3: The music in here is Jarring
Person 2: Yeah that's where Jumoke's tend to gather.