bimbi
A prison inmate; generally a nickname for a friend (guy or girl) that you have gone through a lot with.
Guy- "She's my bimbi- we do everything together. We go on vacation, travel the world together, and know eachother inside and out."

Girl- "My bimbi, he knows me so well he could finish my sentences"

(Originated from the name of Malcom X's prison inmate, who went by the name Bimbi)