"That's it!" (6)
(Other definitions for yes that I've seen before include "Affirmative reply" , "Agreed" , "I agree" , "Oui" , "Affirmative response" .)
(Other definitions for aha that I've seen before include "Exclamation of discovery or triumph" , "Palindromic exclamation of triumph or surprise" , "I see!" , "Cry of triumph" , "Bingo" .)
(Other definitions for eureka that I've seen before include "Discoverer's triumphant cry" , "Exclamation of triump from Archimedes" , "Cry on a great discovery" , "I've got it!" , "Archimedes' cry of triumph as he ran naked through the streets of Syracuse?" .)