A term used to describe marks left on the inside of a toilet bowl after a rather large stool has been squeezed out. It differs from 'normal' skid marks as it leaves somewhat of a pattern, rather than just an up-and-down streak, and may sometimes resemble a map of Africa, or any other map for that matter.
Jane: ''Harry, take a look at what someone has left in the toilet.''
Harry: ''Good grief, I've never seen anything like that before.''
Jane: ''It's the biggest map of Africa I've ever seen.''
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