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2.
A woman who is as wicked and evil as the worst of your nightmares. One with whom you do not want to upset or anger.
I went out with Blackheart. I did her wrong. All i remember is her watching me slither and squirm and laughing while she watched me burn. She is far more fierce than her male counter because she can bleed for 5 days and not die.
by Joni December 10, 2004
 
1.
1. A woman who is as wicked and evil as the worst of your nightmares. One with whom you do not want to upset or anger.
2. A woman who kicks people out of cars when she is angry. Not cool.
3. A woman who is ugly. Both physically and personality.
4. Typically drives a Silver Honda CRV.
5. Enjoys borrowing things and returning them at the worst times possible.
I used to date a girl by the name of Black Heart. Worst time of my life. Ever.
by Secret! =) July 14, 2008
 
3.
1. A woman who is as wicked and evil as the worst of your nightmares. One with whom you do not want to upset or anger.
2. A woman who kicks people out of cars when she is angry. Not cool.
3. A woman who gets uglier as time goes on.
4. Typically drives a GREEN jeep.
5. Enjoys giving gifts that are easily broken so she has an excuse to rage on you.
I used to date a girl by the name of Black Heart. Worst time of my life. Ever.
by White Heart November 17, 2009
 
4.
The son of the Devil, and one of the main enemies of Ghost Rider.
When Black Heart tried to bring Hell on Earth, it was up to Johnny Blaze to stop him.
by Danny Duignan February 18, 2008
 
5.
Blackheart is a demonic entity created by a century of human sacrifices on a hill named Christ's Crown (named so for the circle of thorn bushes around it). The son of Mephisto, Blackheart is next in line for ruling the Netherworld, Marvel Comic's definement of Hell.

Blackheart usually appears as a pitch-black, twelve foot tall humanoid-demon with dripping red eyes, a mouthless face, and a huge mane of spines running from his head down his back. He can change his apperance somewhat, but the more people that look upon his true form, the weaker he gets. Currently he has all the powers of the Netherworld at his command after killing his father Mephisto, and can summon a plethora of demons, dark lighting, inferno portals, and other arcane magics to his aid.
"Blackheart has all of the Netherworld's power at his disposal, he must be stopped!"
by Jin Saotome January 09, 2004
 
6.
A water balloon with a rock inside it. Typically used by drunks, frat boys, date rapists and drunken frat boy date rapists. Or the mentally retarded. People who throw black hearts are typically murdered by their targets.
Man: "Those shit-headed frat boys threw a black heart at my windshield and so that is why I cut their testicles off and stabbed them to death."

Officer: "Oh! A black heart? That's understandable then. You're free to go."
by doublerdiner July 29, 2010
 
7.
A wickedly cool demon guy who is the son of Mephisto in the Marvel Universe. He is really tall, has spikes on his head, and can kick serious butt. He also kills his dad at the end of Marvel Super Heroes.
by The Wraith October 05, 2003