cram bone means: Kevin, a hillbilly dork idiot A Southern-type person, slow and not very bright. A dolt; someone who is stupid or foolish. Person whose mental ability is below average. Person with moderate or severe mental retardation who is between three and seven years old and can communicate and perform simple tasks when under supervision. This term is no longer used and it’s considered offensive. Uncle Pecos also sings about cram bones in Tom and Jerry. Nobody knows the origin of the term, but you’d probably say it if someone said something stupid. (in Community Dictionary, added by Aubree Flores)