Miley Cyrus -- Topless Fans Wait While Miley Pigs Out (VIDEO)

Miley Cyrus fans have the same gimmick as the singer herself ... a gimmick they believe will stop her in her tracks.

A few loyal fans were waiting outside the 'Tonight Show' Thursday, while Miley jawboned with Jimmy about her pet pig ... a pig that is vegan and apparently grossly overweight.

Miley isn't afraid to judge the relative virtues between dog and pig poop.