Someone who only cares for appearance and lacks personality, they are into all the latest trends and shun people who are not the norm(unless they can use them for something). Jamtarts are often under 120 pounds and are usually seen in malls or popular bars wearing shirts too small for them, alot of pink, and have shoes less than 2 months old. They enjoy drinks with straws and standing around where they'll get the most attention.
They are also known to have poor spelling and grammar, and often talk without end about their dating habits or things they have recently purchased.

Jamtarts often don't know you're insulting them even when you do it to their face.
"Come on Ned, let's go to the bar and pick up some Jamtarts!"

"While walking through the mall, crowded with people, we happened upon a fashionable clothing store, completely infested with Jamtarts."
by Tigertosser April 24, 2004

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It can Replace any offensive word there is. It can also mean pussy, fag,or someone thats a little weird can be called jammy.
That kid is such a JAM TART
by Cadd E September 13, 2008

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a whore that's on her period
person 1: "did you fuck stacy last night?"
person 2: "nah, she was a jam tart"
by purpleninjawithzecat August 19, 2011

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younger version of a tart, 11teen to 17, anyone in this age group that wanders into your site while your looking for ladies... you should be disappointed and turn away
1st dude in car: hey whats that up ahead?
2nd: wtf? man thats a jamtart!
1st: fuck! dam jamtarts!
by Kenladin October 15, 2004

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Idiot. Dumbass person
1. That kid is a jamtart.
2. Look at the kid cutting his finger off, what a jamtart.
by Andy W November 23, 2003

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A Child under five constantly in public with Jam on his or her face. Jamtart's are often slathered with jam as they are temperamental children and Mom is too tired to fight the child by washing the face area, parent gives up the 'pressure' of presenting child in public.
Sally never knew that washing a child's face could be such an ordeal, instead to ease her mental pain, she let him run free around town as a Jamtart Baby.
by CRomeo March 27, 2007

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