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2.
A male clown's nether region, 'no no place', or 'where his bathing suit covers'.

Generally clowns are a festive bunch and as such, their package is often festooned with various comedic devices. The most popular way to spruce up one's 'jimble jamble' is to jam a decorative umbrella up the pee hole, which can often lead to hilarious results when using the restroom.

A great conversation starter.

Other varieties of jimble jamble include - popcorn necklaces, Dr. Seuss books, apple sauce, x-mas lights, a jar of almonds, and many more!
Hey bozo thats a nice looking jimble jamble you've got going on there. The red really brings out your nose.
by Tzacks July 10, 2009
 
1.
something that doesn't make sence.
that speach he did was all just jimble jamble to me.
by Candida January 15, 2007