This scenario would play out when two consenting adults decide to engage in anal sex. The guy pulls out when he's finished and decides not to clean off any poo remnants that may have collected on his shaft and instead falls asleep. When the aforementioned gentleman wakes up, he is greeted with morning wood, he then notes that the hardened dried poo appears to look like flakes of rust... hence a solid rusty.
Corey really regretted forgoing cleanup after last nights romp with Morgan, when he woke up with a solid rusty.
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