The action of getting dissed or humiliated in front of others. This word is then said by a bystander not by the people taking part in the action. Not normally a good thing to have happen to you- but a pretty chill way to call someone out on it.
Alternate spellings include: deaded, deded, dedded
Josh: Yo i hooked up with this chick last night- she was bangin.
Andrew: Nah son, she was like prepubescent- she looked like your 5 year old sister.
To dot someone is to respond to his or her latest message with serveral dots in a row. He or she then becomes dotted.
The dot method is often used to show your lack of interest or displeasment. Common places for this method is Instant Messaging, IRC and mobile text messages.