Ok heres a correct definition. :P
1) To whipang someone means to slap them.
2) Whipang is the sound of a slap.
3) If someone is whipanged, they are shamed.
"Oooh whatch out, Patty might whipang you..."
*Whipang*
"I think your assjust got whipanged!"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi