People sometimes refer to behaviour which celebrates a great victory or success as triumphalism, especially when this behaviour is intended to upset the people they have defeated.
[mainly British, journalism]
There was a touch of triumphalism about the occasion.
triumphalism in British English
(traɪˈʌmfəlɪzəm)
noun
excessive celebration of the defeat of one's enemies or opponents
Derived forms
triumphalist (triˈumphalist)
adjective
triumphalism in American English
(traɪˈʌmfəlˌɪzəm)
noun
a proud, often arrogant confidence in the validity and success of a set of beliefs, often, specif., religious beliefs
Derived forms
triumphalist (triˈumphalist)
adjective, noun
Examples of 'triumphalism' in a sentence
triumphalism
If there was a strand of triumphalism in American conduct, why should there not have been?
Max Hastings Nemesis: The Battle for Japan, 194445 (2007)