Hey, girl!
Want a boyfriend or husband with no spine? BE BOSSY!
Want to drive all of the decent men from you? BE BOSSY!
Want to be told by both men and women that you are a certified, grade-A beyotch? BE BOSSY!
Remember, girl, if you want to make it in this world...BE BOSSY!
http://www.youtube.com/watch?v=B0lKdYQkMW4
I think in this context Michelle means assertive more than literally bossy.