What does "boo" mean?

Yeah I call girls boo all the time (really, check my answers). It's just a small term of endearment. But when I have a girlfriend I tend to call em boo a lot too. Yeah, it's something like "sweetie". Nothing too substantial boo ; )

It's unusual to give someone a pet name if it's just a friend. But I guess it could happen.
Don't read too much into it.

Boo is like sweetie, honey, whatever term of affection. It can also be another word for a girlfriend, but since you're not his girlfriend it's a term of affection.
PS leave other girls boyfriends alone

Why do you flirt with a guy who you KNOW has a girlfriend?

Why am I the only one asking this question?

Maybe, some fine day, you'll be in what you think is a committed relationship...only to discover your boyfriend has been flirting with another girl through text/email/work/school/messenger. You'll love it, I'm sure. It's the best feeling in the World. Then, you get to think back to the time when you did this to some other girl and it will be awesome.

There's wifey, baby, and boo in that order wifey is the top notch where all girls want to be. Then there's baby that's ok he likes you have feelings for you but not better than wifey, than there's boo not really nothing he can call a lot of girls that even girls at the super market... but boo means sweetie in other words'' boo is just easy to say and text... and esp when he has a gf..

i don't think its too big of a dealllll.
its just like sweetie.