Stands for drama
. For example if a girl excessively nags you to talk to them or likes to make things seem bigger of a deal than they are. Best used to describe someone who is a drama queen, attention seeker or a person who thinks the world revolves around them.
"Did you hear Katie dumped Tony in class today! Everyone was watching!"
"Yea, that b**ch is all D&A"
(best for MSN or text language, you'll sound quite the goon saying D&A to someone who's right next to you ;)]