tigpotamus 

An extremely obese cat with an underbelly that swings from side to side when it walks or runs, that resembles a hippopotamus,

'Whoa, thats a hairy tigpotamus sleeping on your sofa'.

tigpotamus by jack chipper January 11, 2009

twigopotamus 

What one calls the stick between his legs, especially if it is small. Derrived from rigopotamus.

Dude, put your twigopotamus away, no one wants to see that!

twigopotamus by ghetto boz October 16, 2003