Is there an adjective or adverb depicting self-promotion (or promotion of a group one belongs to)?
I am thinking of something that has a somewhat negative connotation, in the spirit of phrases
- patting yourself on the back
- shameless self-plug
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A person who engages in shameless self-promotion is self-aggrandizing.
Merriam-Webster's pithy definition:
self-aggrandizing, adjective: acting or seeking to make oneself greater.
Exhibitionism (noun) is behaviour to make people notice you and is usually used with a negative connotation.
Several self-promotion verbs (pitch, tout, vaunt, pimp) can be used as adjectives when given -ed suffixes; for example:
I joined the much-touted club.
The meaning seems to be clear and correct; however, although much touted has seen some usage over the years, much-touted has not: The frequency of use of touted by itself is a few dozen times higher than that of much touted.
Also consider adjective ostentatious, which often refers to pretentious self-promotion intended to attract notice.