A sexual activity between three
people, including at least
two women, in which the third person is lying down on his back between
two women who are kneeling up and supporting each other, while the person lying down uses his thumbs to massage the insides of the women's vaginal walls, thus causing both his thumbs to be in the upright position.
"
Suzie, Betty, and I had a great
time last
night. I gave them two thumbs up while they were making out."