Definition
Strong approval.
Origins
American film critics Roger Ebert and Gene Siskel co-hosted a movie review program, At the Movies. The two had different tastes, and often verbally sparred and traded humorous barbs. When both critics gave the film a thumbs up, it was assumed that the film was very good.
See Also
- five-by-five
How People Actually Use It
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.
"When Ebert & Rober give a movie two thumbs up, does each of them contribute one thumb?"
Source: Urban Dictionary