A heartgasm is the result of a heart attack at the moment of orgasm. Generally experienced by the elderly, the chances of this occurring are highly unlikely. Bad heartburn may be mistaken for it on occasion.
An orgasm for your head delivered by a "Headgasm" scalp massager. Only the best feeling in the world. Comparable to the feeling of a cold shiver down your spine, but on the top of your head.
Opposite of heart breaker. From the comic made by Miyuli on tumblr, titled, "Hearts for Sale". Someone who shows affection and love, always giving their heart to everyone else. They give unconditional to anyone and help the heartbroken find their heart again by giving them a piece of a theirs. Until death.
The reason why they're called heartsmith is because it refers to blacksmith instead where the person mends hearts.