when a chick has a dude whipped and she doesn't give him any play. originates from the greek "blu-" meaning bruised, and the latin "ballus" meaning balls. definition comes from the way that his balls get bruised from being tempted over and over, but never actually getting the goods.
friend: you are over at your girl's house all the time, she must really put out.
whipped: no, actually she doesn't.
friend: she is really blueballing you.