The verb "to slunder" means to soil, ruin in a dirty way, make grimy or filthy - but in a non-physical way (see examples). It originates from "slander", and the "un" which is changed originated either from a desire to incorporate "under" into the word - or, more likely, to utilise the un sound from cunt - and thus capture some of the foulness of that, the most terrible of words.
"That wraggot just slundered the atmosphere"
"Don't slunder that little girl's mind"
"The percussionist is slundering this song"
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