To shit in a girls shoe. Usually done while sneaking out after a one night stand.
Dave slept with an ugly girl, but gave her a Dirty St. Nick before he snuck out.
by Cajun King September 8, 2008
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When you are done with a one night stand and the girl is passed out, you shit in one of her shoes as if you were St. Nick leaving her a treat.
Dave: "I fucked this girl last night and gave her The Dirty St. Nick"

Steve: "What's a Dirty St. Nick?"

Dave: " I shit in her shoe while she was asleep".
by Ed K75 October 17, 2008
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