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1.
A four-sided triangle. Also impossible to draw.
When my Algebra 2 teacher said that there is no such thing as a four-sided triangle I simply drew him a wumbus.
by freebirdthemonk January 25, 2011
 
2.
The shape made by the outline of an ice cream cone with a scoop of ice cream in it.
Mother: What is your favorite shape?
Child: A wumbus!
by hayleybrooke November 22, 2012