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1.
The act of cleaning out one's colon in preparation of anal sex (i.e. an enema). Derived from the coloration similarities of the brownie and fecal matter.

Note: During colloquial use, it is customary to replace "the" with a possessive pronoun such as "your", "his", or "her".
Innuendo: If you clean the kitchen prior to anal sex, it can facilitate a healthy colon.

Colloquial: Did you clean your kitchen yet? I want to post a video online.
by John Wilmer November 19, 2007
 
2.
Leaving a formal occasion, usually involving family members, to have sex in a different room, and then staunchly denying the act took place.
Lauren and George left the table in the middle of Sunday Brunch, to "clean the kitchen," and returned an hour later, with smiles and disheveled hair.
by Sukkot January 14, 2012