Fine, I’ll answer the question: BS is for Brilliant Scientist; MS is for Mad Scientist.

Then there’s PhD, which means Phenomenally Dumb. Just kidding. I can’t malign our fine nation’s beyond Brilliant, beyond Mad professors that way. PhD means Doctor of Philosophy, but the French way, which is backwards. Like how SI stands for “System Internationale” when it could just as easily have been “International System”, or LN stands for “Logarithm Naturale”. Le Big Mac. Oh but look, further research says I’m wrong: PhD is Latin, not French, for Philosophiae Doctor. (No, I don’t like ligatures.) That would likely be philosophy in the old sense, as in, where science is natural philosophy, not the “What is the nature of reality? Why are we here? Where do socks go? God is dead!” variety.

So there you have it.