Globules or strands of stray cum which might have travelled further then you thought & thus don't get cleaned up, which once dry look it / resemble a slug!
Ken "I had a good wank the other day in my mums room, I thought I'd cleaned all the cum entrails up but a few cum slugs had formed on the wall which I hadn't noticed!!"
Frank "what happened, did you mum find them?"
Ken "yeah & it wasn't the first time she had found my cum slugs, so I was in deep trouble!!"
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