Dirty Andan
The act of masturbating whilst submerging your scrotum in a teapot of boiling water, and then finishing it off by ejaculating into the teapot, garnishing with flakes of burnt skin, and serving to an unsuspecting person.
"Your grandmother asked for some tea, so I gave her a Dirty Andan."
"You fucking degenerate."
"You fucking degenerate."