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A half dinosaur and half hippopotumus, used when you can not remember the ending of the word hippopotumus.
Leslie- Hey brittany look its a hippo... um um ummm

Brittany- Uh... Hipposaurus!!!

Leslie- Thats not it...

Brittany- Nils! what comes after hippo?

Nils- Hippooo.. Um i dont know.
by Call me Squishy November 05, 2008
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