Two thumbs up

[Britney]

An unofficial honor given for excellence in any field. Two thumbs up is/are not contained to any profession/achievement, and, therefore, can be awarded for any outstanding accomplishment.

[Tanya Shivari]

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 womens vaginal walls, thus causing both his thumbs to be in the upright position.

[Luis Fok]

Putting both thumbs up both orifices of the lower female anatomy.