To gloat means:
* To feel or express great pleasure or self-satisfaction, especially at someone else's misfortune.
* To dwell on one's success or another's failure with smug satisfaction.
Example:
* "The rival team gloated over their victory."
* "He gloated about his high test score."
Related words:
* Gloating (noun): the act of gloating
* Gloater (noun): someone who gloats
Note: Gloating is often seen as a negative trait, as it implies a lack of empathy and humility.