Article: http://us.rd.yahoo.com/dailynews/rss/searc....html?gusrc=rss
QUOTE
In dancehall and hip-hop, they are a way of conducting feuds. As Wikipedia says: "The dissed MC will release a track insulting the originator of the feud, which will be responded to with another recording and so on. It is not uncommon for both performers to call each other's sexuality and talent into question, which sometimes results in answer records of a particularly high lyrical quality." Nice use of "sometimes".