When something is dirty rotten!!!
when you do something dirty rotten.
when you do something bad on a good friend
Woman: ewww you're soo dr!!!
John: You're pure dr! That woman you pulled last night was DR!
Mick: It wasn't my fault I was drunk.
Aidan: who'd you pull last night Sean?
Aidan: BUT that's Paddys woman.
Sean: I know but don't tell Paddy.
Aidan: aw Sean that's DR! It's your friends woman!