an exclamation used to
express astonishment,
surprise, irritation, etc. This
phrase was first used in the nineteenth century but its
origin is unknown.
an interjection of an invocation (the
act of
calling on
God for
help, blessing, etc.)
(informal) an interjection of an invocation (the
act of
calling on
God for
help, blessing, etc.). Used to
express one's strong feeling about something.