Priscilla Presley's alleged friendship with Bam Margera appears short-lived, she's ripping the "Jackass" star for claiming she gave him one of Elvis' rings and robes ... telling us Bam made the whole thing up.
Priscilla tells TMZ ... Bam has betrayed not only her, but also her son Navarone Garcia, by falsely claiming she gifted him a couple of Elvis' personal items and filming in their home without her consent.
It's a stark rebuttal to what Bam told us earlier this month .