(Sanskrit पापपुरुष) Literally, "villain, villanous man, rascal." From papa, "crime, mischief, vice, evil, sin, wrong" and purusha, "male, man,, spirit, human being."
"Nârâyana said: O Great Muni! Now I shall tell you the rules of Bhûta S’uddhi, i.e., the purification of the elements of the body. [...] Think, then, of the Pâpapurusa, the Sinful Man in your body. The size of this Man is that of a thumb and it is situated in the left abdomen. The head of him is represented by Brahmahatyâ (murdering a Brâhman); his area as stealing gold; his heart as drinking wine; his loins as going to the wife of his Guru, his legs as mixing with people who go to their Guru's wives, and his toes as representing other sins and venial offences. The Sinful Man holds axes and shield in his hands; he is always angry, with his head bent down and his appearance is very horrible. Inhale air through the left nostril thinking of “Vam” the Rootof air and make Kumbhaka, i.e., fill the whole body with that air, and hold it inside, purifying the sinful man; then repeating “Ram,” the seed of fire, think the sinful man with his own body burnt down to ashes. Then exhale outside through the right nostril those ashes of the Sinful Man. Next consider the ashes due to the burning of the Sinful Man, as rolled and turned into a round ball with the nectar seed of the Moon. Think steadily this ball as transformed into a golden egg by the Seed “Lam” of the earth. Repeat then, “Ham” the seed of Âkâs’a and think yourself as an ideal being; pure and clear..." - S'rîmad Devî Bhâgawatam
"In imagination, the "man of sin" (Papapurusha) is burnt in mental fire,absorbs the centers, unites with Shiva, and then, redescending, recreates the centers, bathing them in nectar. By the mental representation of this process, the mind and body are purified, and the former is made to realize the unity of man and the Supreme Power, whose limited form he is, and the manner whereby the Universe is involved into and evolved from Shiva-Shakti. All these, and other rituals keep the mind of the Sadhaka occupied with the thought of the Supreme Power and of his essential unity with It, with the result that he becomes more and more that which he thinks upon. His Bhava, or disposition, becomes purified and divinized so far as that can be in the world. At length practice makes perfect in Sadhana, and on the arising in such purified and illuminated mind, of knowledge and detachment from the world, there is competency for Yoga. When in turn practice in Yoga makes perfect all limitations on experience are shed, and Nirvana is attained." - Shakti and Shâkta (ch 23 The Psychology of Hindu Religious Ritual) by Arthur Avalon (Sir John Woodroffe), 
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