Noun: A typical case where a female will begin to show sign of insanity, and or bitchiness as soon as she reaches dime (10/10) status. Dime syndrome is caused by an inflated ego due to the transition from a 9.9 to a 10. All dimes have dime syndrome, there has been no scientific evidence that would suggest a dime without dime syndrome.
Although a 9 or below maybe insane, it does not mean she has dime syndrome. Only dimes can have dime syndrome.
1: Wow your girlfriend is smoking hot! She's a real 10 in my book
2: Yeah but she's a nut case..
1: Oh yeah, must be the Dime Syndrome.