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Definition 1: The rectal cavemen work effortlessly through the night to make sure ur arse is free of klingons to ensure that dangleberries do not occur.

Definition 2: Sifting through ur buttox clearing a smooth passage way to ur anal glands thats the rectal cavemens main objective.
"i woke up this morning and it seems the rectal cavemen have been working overtime"

"seems the rectal cavemen have left me with a severely nippy ring this morning or should i say sting ring"
by J. Edmund H January 30, 2010