WordWeb Online

1. Someone who deliberately behaves in such a way as to attract attention
   - exhibitionist, showboat [N. Amer, informal]

1. Display proudly; act ostentatiously or pretentiously
   "he showed off his new sports car";
   - flaunt, flash [informal], ostentate [archaic], swank [informal], parade, showboat [N. Amer, informal]

Derived forms: shown off, show-offs, showed off, shows off, showing off

Type of: display, egoist, egotist, exhibit, expose, swellhead [N. Amer, informal]