Other forms: exhibitionisms
Exhibitionism Is acting in a way that deliberately and extravagantly draws attention to yourself. Your brother's exhibitionism might lead him to wear a colorful wig and a tuxedo for the first day of school.
There is a kind of exhibitionism that is considered a psychiatric illness — generally, this involves being naked, or partially naked, in public. The more ordinary type of exhibitionism also involves behavior that attracts notice, but it might be singing and dancing in a mall, wearing eccentric clothing, or another conspicuous way of acting. Exhibitionism comes from exhibit, "action of displaying," from the Latin exhibere, "to show or display."