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A term used usually by women describing a boy or man who acts like an asshole to them always. A j-hart usually cockblocks himself but can't even hook up with a girl who has one leg and or one arm, if he wants too! However, as much as a j-hart cockblocks himself he can actually get some from girls being over two hundred pounds. When seen with a j-hart you are usually categorized under a pothead, meathead, and nutner.
Zach: yo you are being a real j-hart hooking up with that fat girl on the stairs.
j-hart: nahh she was only over two hundred pounds and her face was pretty.
Zach: it really wasn't
j-hart: whatever...wanna go to the gym with me?
by looondon March 05, 2007
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