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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.
Did you see the new Jeffy video?

Yeah!
Jeffy by t series < pewdiepie October 30, 2018
the dude who is on crack and is high and like to hit his dick all the time and ask for money so he can stuff it in his diaper and the definition of cancer who DOES NOT like peas and he can rap like a motherfucker
jeffy dad get me a cheerio box jeffy so I can stick my peepee in it

mario why
jeffy by THE SWAG NIGGA 05 January 2, 2019
A retarded puppet that children find funny because of dark humor
Guy 1:yo have you watched the new jeffy video?
Guy 2:dude how old are you?
Omegle stranger disconnected
Someone who is kind and loving. Someone that you can trust and who always has your back. A word that means love, trust, and happiness.
You are a true jeffy.

I jeffy you with all my life.

You're are my jeffy, heart, and soul.

I can really jeffy you with my secrets.

I'm so jeffy right now I can hardly speak.
Jeffy by missme_questionmark January 21, 2013
jeffy hates green beans his daddys the tooth fairy oot oot oot if you try to steal his bike he will whip your ass
jeffy stop it
A hot nickname for a guy. Also very cute one. He is funny and strong. He surprisingly fast for his height...
"ughhh...Jeffy is such a stud."
Jeffy by Marisol.R April 9, 2017