A word used by british policemen, used to explain an astounding and surprising fact in thier case. Alas the fact is quite rarely astounding or surprising.
Egads! Johnson put away your toad! You suprised and astonished me!
An exclamation used when extremely surprised, excited or horrified. Is always followed by an exclamation point when written out.
Egads! That guy should do something about his brambles.