Adjective: One who is completely self-absorbed and living in a false reality. This altered universe usually involves faux-cougars, beer pong, Argyle socks, and Republican Supremacy. Someone who believes they are diceroy is often known to have "man-night" and other separatist activities, reminiscent of the antebellum South.
OMG, look at my trampstamp! It is so DICEROY!