A person who is constantly advertising and praising his/her self by indirect means.
(Origin: "The Mind-Body Problem" by Rebecca Goldstein.)
She's an example of the more obnoxious sort of peacock: a closet peacock. Once you get the dictionary to her private language, you understand that everything she says translates into self-praise.
... Right now, she was complaining to me about the ENORMOUS size of her classes and her need to procure a second graduate student to help with the grading. Translation: "I'm such a POPULAR teacher."
(Mind-Body Problem, p. 236)