What does YDK mean?
You Don't Know
Other definitions of YDK:
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How to use the term YDK:
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More slang terms:

IEF
It's Esther's Fault

4EVER
Forever

OICU812
Oh, I See You Ate One Too

PMH
Pre-Menstrual Horniness; a term commonly used by women going through menapause, also known as "Cougars". Also used by women before they get their period (a symptom of PMS) when they get horny during PMS