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2.
to pat somebody on the back; to felicitate; to approve of.
The boy secured 95 marks out of 100 and his teachers backpatted him.
by uttam maharjan November 03, 2011
 
1.
The annoying way one person (usually female) will pat another person (usually male) on the back during a hug, signifying that sex between the two will never, EVER happen. However, this can also used by males in a professional setting to avoid premeditated sexual harassment charges by a female colleague.
Ryan: "Dude, I hugged Veronica and she just gave me the back pat AGAIN."

Justin: "Yeah... she did that to me, too. We are so NOT getting any ass from her."
by djfour May 28, 2010