[1] : The Collaborative International Dictionary of English v.0.48

hotshot \hot"shot`\, n.
   a successful, self-confident person who is regarded by others
   as highly skilled; -- sometimes used ironically in reference
   to aggressive persons whose opinion of their own talents is
   considered exaggerated.
   pjc

[2] : The Collaborative International Dictionary of English v.0.48

hotshot \hot"shot`\, a.
   1. highly talented, self-confident and successful.
      pjc

   2. flamboyantly displaying one's skills.
      pjc

[3] : WordNet (r) 2.0

hotshot
     n : someone who is dazzlingly skilled in any field syn: ace,
         adept, champion, sensation, maven, mavin, virtuoso,
          genius, star, superstar, whiz, whizz, wizard,
          wiz
see also:
ace adept champion sensation maven mavin 
virtuoso genius star superstar whiz 
whizz wizard wiz 

Hotshot >> H Words
Hotshot, definition of term: Hotshot
hotshot_pag1.html