What is this song???? Tell me is it time to get down.......on your motherfuckin knees?

Answer 1

Could be one of two:

I'm willing to bet you're thinking of "Battleflag" by Low Fidelity Allstars. Here are the lyrics: http://www.msu.edu/~ovittles/lyrics/battleflag.htm

If that's not it, maybe it's "B****h Please" by Snoop. The lyrics aren't identical to what you asked, but they're similar.