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8.
Someone you care for, crush on, talking to, but have not made it Facebook official.
Jonathan: Hey girl! Is that your new boyfriend?
Hannah: No, that's just my boo thang!
by jRush February 07, 2012
 
9.
giving off the lesbian/gay vibe with your best friend.

when everyone else texts their boyfriend/girlfriend, you text your boo thang.

the person who you have sleepovers with and read books in bed.

you don't have to be doing anything, and you still have fun.
Brynna: "hey boo thang."
Samantha: "hey boo thang."
Some other person: "Are you two dating?"
Both Brynna and Samantha: "Uh...no. We're boo thangs."
by boothangsforlyfe December 12, 2011