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.
Samantha: "hey boo thang."
Some other person: "Are you two dating?"
Both Brynna and Samantha: "Uh...no. We're boo thangs."
You: No, not yet. He's still my boo thang.
2:a person who makes you smile; a person you have feelings of warm personal attachment or deep affection for.
ay im wit my boo thang i`ll call u later