Can be one of two things.
1) A stupid wannabe rapper like 50 cent or Ja rule
2) A really foolish and crazy religious dude from the RaptureReady.com website. And since most of the people on that site are already kind of nutty, a true Raptard will stand out and shine, believe me.
Raptards like 50 cent suck ass and should eat dirt. At least the second kind of raptard is somewhat interesting.
Anyone who makes up their own words and babbles them in a monotone with tired 1990s clichés about drugs, violence, sex, and money over a repetitive beat box and synthesizer loop with his hand on his crank. Usually has several "musicians" to back him up in case the other "band" wants to steal his equipment and sell it for crack. To portray a false illusion of musical talent they usually include a female soul singer in their recording so she can hide their crack in her panties.
Y'all wiggas will buy any CD by any raptard that the media will market to your demographic. MTV is one of the biggest marketers of raptards.
Anyone who makes predictions as to when the Rapture or the end of the world will occur. A combination of the words "rapture" and "retard".
The man who predicted the world to end on May 21, 2011 is such a raptard.