a word that can be used in place of any word that you can ever think of, usually this would be a curse or bad word. Used to create funny sentences.
"You are a flipping gelf"
" I heard you gelfed that girl last night"
"OMG i just gelfed in my pants"
"My girlfriend dumped me, what a gelf"
by Matt Thoggy August 17, 2007
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a mythical elven creature which follows you around and is essentially a part of you
sometimes I just want to kill my gelf

I love to play with my gelf
by Kouji March 2, 2008
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Guy Everybody Likes Friend. Commonly used by drunken party-goers on the London Underground.
Due to his friendly nature, that one definitely looks like a gelf.
by Gordan Brown October 28, 2009
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Genetically Engineered Life Form. Gelfs are all that remain of humanity after we render ourselves extinct in the far future, but we leave cultures of mix-matched animals on terraformed planets. Created by Rob Grant and Doug Naylor in the TV show and books of Red Dwarf.
Lister: We've got to shake it. What's over there?
Kryten: Gelf Space.
Lister: It'll never follow us in there.
Rimmer: No because Glefs are untrustworthy dangerous savages, it would be insane.
by Wingy December 12, 2005
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