"Peek-a-Boo!"

All right, I promised I'd do this, so here we go. What's 'boo'?

First off, it's Jane, with a solid answer:

I went to www.pseudodictionary.com, and it says:

boo - Girlfriend or female aquaintance.

e.g., Where's your boo? You're always with her.

Want more proof? :)
http://www.pseudodictionary.com/boo

Good one, Jane. Research to back up your answer always helps. You're getting an 'A+'. Here's Richard:

Boo means boyfriend/girlfriend/significant other. I have no idea why, but then again, questioning slang is normally not a good idea for the same reason you don't ask some people how they are doing; the story is too long and probably isn't something you want to hear.

Richard's right about that. Next up is Leanne with her interpretation:

I can't believe I'm emailing from work to explain what "boo" is, nonetheless, I like 'splaining.

A "boo" is someone's significant other. i.e. girlfriend, boyfriend, wife, husband.

Not bad for a 29 yr old gal who's (obviously) hipper than you! ;-) Yesss!

Maybe you're hipper than me, but that's not saying much! Uh, wait...

Jason explains it like thus:

a lot of people in the hood refer to their significant other as "boo." Hence, "whatcha doing tonight boo?" It came from calling your sig. other "boo boo" and just got shortened. it's a term of endearment basically. they also call eachother "shorty" a lot. go figure

You go, shorty! Here's RaMa, who's obviously done a lot of work:

I think 'boo' has a few different meanings. A friend told me it meant 'boyfriend', but I'm searching on google for some evidence at the moment and I found a totally different meaning. On this page (http://www.geocities.com/a4medical/drug.html) you can find a lot of street slang that's related to drugs. This page says that 'boo' means 'marijuana'. But I just found another page where someone asks the same question as you did (http://www.stupidlyhappy.com/archives/
000530.html). Although it's gone off-topic pretty quickly, one poster says that 'boo' means 'boyfriend'. I also found another page that says 'boo' means boyfriend (girlfriend or boyfriend to be exact, there is no boo'ess or something). You can find the site here: http://haute.hypermart.net/c1/slang.htm
But all the other search results say 'boo' means 'marijuana'. Maybe you can find more meanings for yourself, if you want to. Just look for 'boo street slang' on google.

I think we're getting closer to The Ultimate Truth of Boo. I'll let Commander Windguaerd (guy, is that your real name?) take the second-to-last slot:

Means another woman.

Thanks. Brief, and to the point. And finally, here's Mario:

I can only speculate the 'boo' means 'crying mood'. 'boo' being the onomatopaeia of a childish cry.

Good guess, but I think that's wrong. You weren't the only one. We had a lot of different interpretations, but the majority has spoken. To wrap up - Kelly appears to be singing about her best friend, her girlfriend. Even when she's with her best friend, she's thinking about Nelly. Perish the thought. And now I'll finally be able to banish that damn song from my mind. Phew.

Thanks all! You're the best Regular Readers a journal-writing guy could ever wish for  ¶ 20:29