a purple hippo that has been in sentenced to jail with a bad temper. usually has a weapon and will often stick it up...places. loves root beer and worships the foot gods. shankapodimuses will often go to the mall to celebrate being released from jail.
Example: When you're at a movie and someones phone rings, when they answer it and start talking to whoever called like it's no big deal, that's a shankapotamus.
Someone who makes a bet then upon losing makes up excuses tward the technicalities of the win...oh and they don't pay up.
winner: alright thats game man, now pay up.
loser: are you sure that last move was cool with the rules, i mean...
winner: oh come on..
loser: it was like on the wrong side..and.
winner: oh..dude..you are SUCH A SHANKAPOTOMUS.
loser: i know...