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Unwholesome gas given off by Time Snails. One of the great mysteries of the universe is where time goes to. Seconds, minutes, days, and years go by, but where too? The answer: time flows into wormholes. If it didn't, the universe would fill with time until it exploded. But if time simply flowed into wormholes and into other dimensions, they woud explode. This is where Time snails come in. They perch on the edges of wormholes and consume time, which is promptly digested. In doing so, they give off the gas known as gneff. Basicly, gneff is a time fart.
The physicist detected the scent of gneff, so he knew he was near a wormhole.
gneff by ps123412 November 29, 2010
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verb- Used in Hawaii Nei, meaning "I Get it."
Leilani: "Ehh, Koa you get pakalolo?"
Koa: "Yeah Lei I geffum."
geffum by Tyson&Sachi April 28, 2008
Related Words
gneff geffen geff geffy GREFF Geff grade school geffing geffon Geffrey geffum
An idiot of the first degree.

'Citing!
Person 1 runs into a tree repeatedly for an hour.

Person 2 points and says "What a geffend!"
Geffend by diskodoll March 19, 2007
The definition of 'GREFF' is an object in an un familiar environment, it can be used to replace curse words e.g f*** of. it can also be used to describe dirt
oh michan u rhyl victim greff of
oh just shut the greff up
look at all this greff on your desk
oh ben greff of with ur 50p television
Originating in Savannah Ga more specifically Richmond Hill, this is a slang term to be used in place of the word "fuck" or as a derogatory name (geffy) meaning that the person lacks competence and the ability to attract females.
"What the geff is wrong with you that made no geffing sense"
Geff by Savannah Slang October 22, 2020

Head Greffley 

A demon that has a cult following, a virus among men. It is also defined as a major slur among people as all shapes and sizes.
I believe in Head Greffley, he will free us one day.
verb- Used in Hawaii Nei, meaning "I Get it."
Leilani: "Ehh, Koa you get pakalolo?"
Koa: "Yeah Lei I geffum."
geffum by Tyson&Sachi April 28, 2008