The ultimate insult during an insult battle.
Di (dye) = Opposite (in this case the opposite of fake = real);
Psudo (sudo) = Fake (these two put together do nothing but make the word longer, but as most people know, the longer the insult the better);
Poly (...poly?) = Many (in this case implying he/she gets around);
Gay (Gai!!) = Gay (as in "Ur Gay LOL!!")
Ist (Is+t said like a german would) = One who is (in other words "Ur Gay LOL!!")

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.