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1.
Buttocks, Bottom, Ass (USA), Arse (UK and Commonwealth), Posterior, Rear end, etc. Usually referring to a big or fat bottom.

Mostly North American usage but deserving wider currency.
I watched him saunter away, all the while chowing down the need to give him a good swift kick on the behumpus.
by BonoboBoy April 12, 2011
 
2.
Buttocks, Bottom, Ass (USA), Arse (UK and Commonwealth), Posterior, Rear end, etc. Usually referring to a big or fat bottom.

Mostly North American usage but deserving wider currency.
I watched him saunter away, all the while chowing down the need to give him a good swift kick on the behumpus.
by BonoboBoy April 12, 2011