A person of lame attitude, and lame origins. It can be used to describe people from the ghetto, or other lame parts of town. The lame attitude bit can define anyone, the lameness is in the eyes of the beholder.
John is from the deep ghetto. He's so eambo.
Kate failed her math test and went to go do drugs with the gangstas. She's so eambo.
Percy is quite eambo. He stood Lucy up last weekend, and he just stood up Marta.