deck the balls

1) To festoon one's testicles with colored lights, evergreen garlands, and tiny Christmas ornaments

2) To punch Santa Claus in the nuts for shortchanging you last Christmas

1) I wanted to make my girlfriend feel merry in the bedroom this Christmas so I decided to deck the balls.

2) In spite of being a good boy, Santa gave me nothing but a pack of underwear last Christmas, so this year I'm gonna wait in ambush in front of the fireplace so that I can deck the balls.