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8.
It also refers to a book or magazine that has been in the bathroom. Its a Costanza reference.
"I'm sorry, sir. This book has been flagged."
by JonathanRVA January 02, 2006
 
9.
Pull someone's shorts or pants down.
"I got flagged". Someone snuck up behind me and pulled my britches down.
by Craig B September 08, 2005