You say it when you "get it" (3)
I believe the answer is:
aha
(Other definitions for aha that I've seen before include "Exclamation of triumph or mockery, a palindrome" , "I see!" , "Surprised expression" , "I'm surprised" , "Bingo" .)
I believe the answer is:
aha
(Other definitions for aha that I've seen before include "Exclamation of triumph or mockery, a palindrome" , "I see!" , "Surprised expression" , "I'm surprised" , "Bingo" .)