He is not talking about the pineal gland when he says "they'll never see the P". That is George Clinton appearing as a guest on this track. Clinton was the creative mind behind Parliament-Funkadelic, also known as P-Funk. Clinton's style of funk music was a huge inspiration on what was to become hip-hop music, especially in the west coast scene. That's why he gives a shout out to the P.
He is not talking about the pineal gland when he says "they'll never see the P". That is George Clinton appearing as a guest on this track. Clinton was the creative mind behind Parliament-Funkadelic, also known as P-Funk. Clinton's style of funk music was a huge inspiration on what was to become hip-hop music, especially in the west coast scene. That's why he gives a shout out to the P.