The scrawling, sloppy style in which a drunk person writes, which is in no way legible the next day. However, it may be a direct translation of how the drunk person was actually speaking.
We had a pretty brilliant idea at the bar last night, but I wrote it down in slursive at 1am and I can't read it today. It appears to say "fouwiinog tat hogaurl."
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!!"