Verb (used with object) : a bird that befouls its own nest.    From Dictionary.com. 

Your befoulment is the least of your worries!.    From Wordnik.com.  [Archive 2007-12-01] Reference

He could not throw the onus of it upon her, by revealing to her that the necessity of protecting her name against the befoulment of The.    From Wordnik.com.  [Success A Novel] Reference

Crown, are subjected to their vile disguised attempts at bribery and corruption, no humble peasant girl, no child, is safe from the befoulment of their filthy minds.    From Wordnik.com.  [South Wind] Reference

Perhaps, too, certain effusions of Ruysbroeck, seeming to spurt forth in twin jets of black and white flame, were worthy of comparison with the divine befoulment of Grünewald.    From Wordnik.com.  [Là-bas] Reference

The Daily Mail obviously like to think that whichever latest befoulment to their world is the worst thing ever, proof that the country is going to the dogs and evidence that Britain is not only broken, but split asunder, never to be fixed.    From Wordnik.com.  [TEAMtalk Football News] Reference

Were we doomed again to carry such befoulment?.    From Wordnik.com.  [Sorceress of the Witch World]