Nancy

Jeffy's Mom is a character mentioned in almost every video Jeffy appears in. She is Jeffy's mother. She appears to most likely be a bad mother, as she appears to dislike Jeffy due to his stupidity. That's probably why Jeffy was dropped at Mario's doorway.

A theory made by PCrafterZ, a sml ytper, has said his mom is Daisy, but this has not been confirmed by SML officially.

Quotes:

"Please babysit.... sorry."

"Sorry, again."

It is unknown if she will would make an appearance in the future videos.