Jeffo is the main antagonist of the Stars Wars parody 2018 SuperMarioLogan episode, Robot Jeffy. He is the robot clone of Jeffy.
Jeffo looks like Jeffy, however, unlike Jeffy, Jeffo has three buck teeth and glowing red eyes.
- Jeffo is technically Codo's son since he created him.
- Jeffo is killing Bully Bill and he call him a Retard