Its is where a man sticks his ball sack in to a woman's Vagina. The man is using the same technique as fingering but instead of using a finger he uses his ball sack. The man can also wriggle his balls around inside of the pussy from more pleasure.
Ohh man i like Vaginaballs because it feels nice when i wriggle my balls in her Vagina
When playing Halo 3, male players can "tea bag" another player after killing them...when a girl does this, however, it is referred to as "Vagina-balling"
Halo player 1 (female): Shot you, haha!
Halo player 2: Whatever, I'll get you next time
halo player 1 (female): But I still got your pride...Vagina balls! (squats over player 2 on the face, repeatedly)