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2.
a session of questioning especially a long or harsh one
My mom gave me the 3rd degree when she saw the stain on the bed.
by The Return of Light Joker December 27, 2007
 
1.
When someone questions you repeatedily about a certain topic, and you wish they'd just shut up about it.
"Quit givin' me the 3rd degree about the party, okay? Nothing happened."
by Stud April 11, 2005