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A nutcase. As in not right in the head. Always have their shirt tucked into their trousers which are half way up their chest.
A person who is most likely to come and regail you with stories in a pub of when they "Nutted this bloke" and how his helper is nicking money from him.
They vary in condition, some are worse than others, with the worst ones not having control of bladder. A common hobbie of a Jellyhead is shouting at passing cars.

Best avoided
"Look at that Jellyhead shouting at the traffic"
"Why's that Jellyhead walking about with his trousers round his ankles?"
by colujimbo November 08, 2006
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Jul 12 Word of the Day
The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.
Message: "i'm free this afternoon so come over and fuck me senseless, my parents will be out all day"
Recipient: Mum
Message Sent
- Onosecond occurs here -
by Jimmed September 26, 2006
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A Jealous Person, so jealous they have their own name.

Reasons to use: If someone is being overly jealous you have the right to let them know that they are being a jelly head.
Mitch: Hey I just won the power ball!!!

Johnny: Playing the lottery is stupid, I work for everything I do not collect hand outs

Mitch: You're such a Jelly Head haha yeaa im in it to win it.
by Mitch Brown August 22, 2011
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John: Hey Lisa, your favorite color is purple right?
Lisa: Yeah, why?
John:Because I got some purple jellyheads we could use tonight
Lisa:Oooh really? I love the grape flavored ones!
by Gizzly Adamz September 17, 2009
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A person dedicated to the music and vibes of the band Lemon Jelly. Usually found posting on jelly forums, grooving to jelly music or just smiling about life in general. A very fine group of individuals.
"My really cool friend is a total Jelly Head."
by Nervous Tension January 06, 2006
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