An expression used to call someone on an obvious lie, prevarication or falsehood.  A way of calling bullshit.  Since it is now known Elvis did mountains of drugs, stating that he had always been clean would be obvious bullshit.  Origin: Penn and Teller's show Bullshit, where the phrase is used to call bullshit on the various claims of creationists.
by the birds and trees May 18, 2008
 Get the Elvis didn't do no drugsmug.
Get the Elvis didn't do no drugsmug.