The cardiac equivalent of a penile erection. This is often caused by an overabundance of love felt which resulted from an emotional stimuli, rather than a physical stimuli which is often the case with a penile erection.
In other words, your girl (or boy) does something so cute/thoughtful that you feel a surge of swoonfulness, often causing a rush of blood to your chest and an overall feeling of being wooed.
My girlfriend gave me a hockey t-shirt today which gave me such a heart boner.
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A reference to the testicles of Washington boys.
Girl: I wouldn't mind sucking on his Washington Apples.
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