(person) by shmOOnkie pOOnks Tue May 09 2000 at 4:51:10
Boo is a slang term of endearment like "baby" (usually male referring to a female).

"I'll be in here, boo" - Method Man (You're All I Need, 1994)
"Won't you tell me, baby boo, what 'ya want? what 'ya need?"

I like it! 1 C!