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1.
to get your pants pulled down by your mates in front of other people
by kRyStLe October 07, 2003
 
2.
verb : the act of defacing an object (usually a book, but not always) by drawing crude depictions of male genitalia upon it
"Damn, Landers dacked my Science book!"
by Grasshopper_74 October 10, 2008