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Something so ugly that even an anand would say "damn, that's gross." Or, something so gross you wouldn't touch it with a shitty stick. An aali is the most disgusting thing you could ever imagine.

A troll. A being that lives, or lived under a bridge or in a sewer system.
"Eww! I touched my cats shit and got aali all over my fingers"
by abbygirlx August 18, 2011