What does bow chicka wow wow mean?

On Facebook my bf put that as a comment on a girls status. She said "Haha..I don't know how to respond to that." Uhm I heard it means your hot, I want to screw you, etc I'm not sure if he knew that though because he isn't a flirt at all, has never called another girl hot except me, and this girl has a boyfriend and my boyfriend and I are pretty close. This is sort of an awkward situation. Is that really what it means? Should I talk to him about this?