PHD
It sometimes stands for "Pay to Have a Doctorate."
He doesn't have a PhD, but a PHD.
Andrew: Angus got his PHD last night.
Sam: You mean his pretty hard dick!
Pump Hump and Dump.
A guido or muscle heads philosophy of life. You hit the gym for the Pump, use your gains to find a girl to Hump, and when she gets feeling you give her a Dump.
What's your philosophy on life?
Me? well it's PHD