A variation of the word retard, usually meant in a derogatory or profound way. Often used in a message board forum or chatrooms.
Originated from an Atlanta based messaged board titled: theregularguys.com
The Regular Guys are a local Atlanta radio show known for it's brutal humor and extreme opinions. It's rumored that one "Cletus" coined the phrase "retart" while posting on theregularguys.com in the midst of a 13 day drunk.
Only a retart would vote for himself as worst alter ever.