After his promotion, he was riding high on success.
Tips
history
From Meng Jiao's Tang-dynasty poem 《登科后》, written after he passed the imperial exam at age 46: '春风得意马蹄疾,一日看尽长安花' - 'Spring wind of success, hooves fly fast; in one day I see all of Chang'an's flowers.'
usage
Can carry a hint of mockery if someone is visibly gloating. Neutral or slightly envious when describing someone else's success.