A nice way of saying:
"I understand/know a lot of complicated bullshit that you couldn't grasp even if it were your dick after 8 hours of hot lesbian porn."
It was once believed PhD was actually French for "
Fuck off idiot," but this was actually proved
wrong by brain-
box PhD holders after years of research.
Some guy:
Ugh, I can't solve this 3rd order partial differential equation...
Professor "blah, blah", PhD : I can, thus my mental-dick is
bigger than yours.
Checkmate.