1. The alternative name chosen for 'The Picture Of Dorian Grey', the ultimate narcissist. 'The Picture Of Derin Grey' was rejected on grounds of these individuals having the potential to lose their minds in a whirlwind of self-love and delusions grandeur.
2. A dandy.
1. "Hey did you see that kid checking himself in that cars wing mirror?"
"Gee what a total Derin."