Characters
It is a sham, but it's a sham with yams. It's a yam sham.
— Buffy ‧ Buffy the Vampire Slayer
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker admits something is a fraud, then delights in a silly twist: it is a sham, but one involving yams. The rhymed wordplay makes the admission comic, treating the deceit as both flawed and oddly charming through the repeated sound of yam sham.
Context reviewed