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Similar to the grundle of dawn; the taint of dawn comes just prior to the ass crack of dawn. The taint of dawn is between the hours of 3am - 5am, and only applies when you must wake up between these hours.
I had to wake up at the taint of dawn to catch my flight.

Good thing i woke up at the taint of dawn and got out before that whore woke up!!!
by Maddog and J'Rod January 11, 2009
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