A unwashed and hardened tube sock used for masturbation.

Cleaning a spent penis of ejaculate/other fluids with soft brittle paper resulting in fragments of paper being left behind.

When you realy don't feel like taking a shower after having intercourse, but your cock is still wet with vag secretions, you go to the bathroom and wrap your meat stick with toilet paper as to not get your undies wet. Also, Toilet-paper-cock is substitutible.