Definition of heart-on:
(n) :
(anatomy) A muscular organ that pumps blood through the body, traditionally thought to be the seat of emotion.
(n) :
(uncountable) One's feelings and emotions, especially considered as part of one's character.
(n) :
The seat of the affections or sensibilities, collectively or separately, as love, hate, joy, grief, courage, etc.; rarely, the seat of the understanding or will; usually in a good sense; personality.
(n) :
Emotional strength that allows one to continue in difficult situations; courage; spirit; a will to compete.
(n) :
Vigorous and efficient activity; power of fertile production; condition of the soil, whether good or bad.
(n) :
(figurative) The centre, essence, or core.