A variation to the word quiter. Most often used in short messages such as Insatant Messaging.
Person 1: So, how did u do with your volunteering today?
Person 2: I worked for two hours straight. It was very tiring.
Person 1: But, u were supposed to work for at least three hours.
Person 2: I know! I'm such a kuiter! Tomorrow I'll work an extra hour to make up the time.