What does "self-aggrandizement" mean?

Behaviour which increases one's own wealth or power, or which is intended to create an appearance of importance.

Self-aggrandizement

Common synonyms include: ego inflation, ego trip, grandstanding, self promotion, self-aggrandisement, self-importance.

noun

noun ·5 syllables ·Rare ·Advanced level

Noun

1
Behaviour which increases one's own wealth or power, or which is intended to create an appearance of importance. countable, uncountable
"[W]hat can selfish greed, what can self-aggrandizement and the most pitiless ambition effect against men who own to such discipline as this?"
2
an act undertaken to increase your own power and influence or to draw attention to your own importance wordnet

"His constant tweets about his work were annoying self-aggrandizement."

From self- + aggrandizement.