I'm shocked! (5)
(Other definitions for yikes that I've seen before include "Gosh! - Oh no!" , "Expression of alarm or astonishment" , "Wowee" , "that was hot!" , "Expression of surprise" .)
(Other definitions for gasp that I've seen before include "Utter breathlessly" , "Have trouble breathing" , "Say "ah"" , "Convulsive breath" , "Puff, struggle for breath" .)