37 definitions of GTO. Meaning of GTO. What does GTO stand for? GTO abbreviation. Define GTO at elancom.eu. 8 definitions of GTO. Definition of GTO in Slang/Internet Slang. What does GTO stand for?. GTO may refer to: Music. GTO Records, a UK record label; GTO (band), an Australian band; The GTOs (Girls Together Outrageously), a late s "band". RS Components RSthe trading brand of Electrocomponents plc LSE: DeucesCracked Community Off Topic Member Videos Secret HQ Section 9 Coaching Coaches Only. Generally, GTO game theory optimal means "most unexploitable". It's a generic term that stands for "Game Theory Optimal. In practice, most people would be better at poker if jewels miner never learned of the concept.