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.