The gungy material found around the genetalia of girls who don't subscribe to the theory of personal hygiene. Bears an uncanny resemblance to limescale that forms in the bottom of a kettle - hence kettle iron. See also, fanny batter
Bob was about to tuck into a tasy fish supper, when he noticed Jayne's kettle iron
by Mista O August 7, 2006
Get the kettle iron mug.