This occurs when you get done masturbating and you try to wipe off the cum with toilette paper. The toilette paper rips and sticks to the side of your shaft. If you dont notice its there, it will harden and dry and form a hard covering over the shaft. Kind of like paper mache.
Dangit theres wanker mache on the side of my shaft from trying to wipe off the semen with tp.
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