What is narcisistic supply?

once upon a time there was a greek god named narcissus. he was so in love with himself that he would sit and stare at his reflection in the pond. narcissus did not love anyone but himself. that is where the meaning of the Word narcisistic came from. it means that you love yourself very deeply and are very full of yourself. therefore the term narcisistic supply probably means that there is no end to the supply just as there is no end to narcissus love for himself.