Word of endearment assigned to a significant other, often used by "ghetto" black people, uncivilized caucasians...preppy white girls.
"Ooo girl he my boo, he my baby daddy doe.."
"Hey lil mammi you wanna be my boo? You lyk3 whit3 ch0c0l4t3?"
"OmGee Branden is totally my boo"
the ghost said....."boooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo!!!'
When a ghetto black girl thinks you are invading her ghetto surrounding, or stairing at her for a little to long, she will say this to you in response.
"Boo nigga boo, aint noboday lookin at you cuz you ugggglyy"
Another way to say something sucks, is bad, weak...
Originally used to comment about someones skill at sports, now used as a common word for bad..
Look at that kid, he is hella boo boo johnson...
Karen is hella boo boo johnson at giving the boss...
School is boo boo johnson...