1 definition by t series < pewdiepie
Jeffy is a character on the youtube channel SuperMarioLogan. He is a puppet that has helped grow his channel and is a very popular character among kids between the ages of 9-12. Jeffy has not only attracted a positive fanbase but also a negative. Jeffy is known for smacking his diaper, having a bicycle helmet on and a pencil in his nose. He hates eating green beans and curses a lot.
by t series < pewdiepie October 31, 2018