A male disposable incontinence diaper with re-sealable vertical aperture, the aperture consisting of a plastic slider operatively engaging two intermarrying plastic seams which are alternatively locked and closed when the slider is in a first position, and open and unlocked when the slider is in a second position, the aperture enabling the wearer to access his penis and urinate outside the diaper without having to first remove the diaper. The plastic slider and intermarrying plastic seams maintain a watertight seal when closed, thus protecting the wearer of the diaper from the leakage of bodily fluids accidentally discharged into the diaper.