The whole passage may be rendered, "Perchance, Lady, you imitate (lit., 'follow') the orifices (lit., 'nooks') of women, and hidden away are bathed, (you) cunt, in your own water (i.e., urine)?"

'Matrona' ('lady, woman of quality'), used properly of a chaste and respectable married woman, is here employed sarcastically in addressing a man, as is indicated and indeed emphasised by the collocation of the masculine perfect passive participle 'secretus' with 'tua, etc.' As regards the exact nature of the activity described, I don't believe that I need elabourate, but as regards the language, I will add that 'sequor' is here also sarcastically employed in its sense of 'follow, imitate' (as of a philosophical school or way of life).