An exclamation of surprise, like when I test drove my car for the first time and the turbo came in.
Me: Mmm, sounds ok, bit slow though.
2 seconds later...
Car: Fsssssssssssssssssstttttt Waaaaaaaaaaaaaaaaap Ptchooooooooooo
Me: CRIKEY MOSES!!!!!!!!
Tommy’s saw his girl naked for the first time and said “Crikey Moses!”