Miley Cyrus proved she knows how to party in the U.S.A. AND Canada Friday night ... by simulating fake oral sex on stage in Vancouver on a Bill Clinton impersonator.
It was all for the debut concert on Miley's "Bangerz" tour -- which was filled with little people dressed as joints, giant stuffed animals, and a lot of ass -- but the big finish was her rendition of "Party in the U.S.A."
During the song ... Miley's dancers dressed up as famous American icons to pay tribute to our country -- and when Bill hit the stage Cyrus quickly dropped to her knees in his honor.
Might wanna dry clean that blue outfit.
Just sayin' ...