A clever reforming of the words crafty bastard. Brian Brushwood, host of Revision3's internet show - Scam School, commonly uses the phrase. He could have been the creator, or one of the people to make it mainstream.
"Today's show is brought to you by the basty craftards at...
I was walking around work tonight in circles, not doing anything in particular and someone called me Castarded and I laughed my ass off and got out of work 20 minutes late bacause I was laughing so hard.
A baby whose parents are retarded and have cancer. When the baby is born it is taken away by the government and put into a large glass of syrup. Before the government sells the baby to a chinese restaurant to be served as pork the baby drinks all of the maple syrup, breaks through the glass, and escapes.
Mathew and Josh are both a Cantarded Maple Syrup Downs' Sydrome Baby Escapee.