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An exclamation of surprise, shock, or astonishment. Holy cow, the bill for that dinner is nearly $200! We won the lottery? Holy cow, that's amazing news!
meek as Moses
old-fashioned Exceptionally patient, humble, and mild in manner or spirit. Despite his hulking, imposing appearance, the huge athlete is as meek as Moses when you speak to him in person.
Also, holy mackerel or Moses or moly or smoke . An exclamation of surprise, astonishment, delight, or dismay, as in Holy cow, I forgot the wine, or Holy mackerel, you won! or Holy Moses, here comes the teacher! or Holy smoke, I didn't know you were here too. The oldest of these slangy expletives uses mackerel, dating from about 1800; the one with Moses dates from about 1850 and cow from about 1920. None has any literal significance, and moly is a neologism devised to rhyme with "holy" and possibly a euphemism for "Moses."
meek as Moses (or a lamb)very meek.
This expression is a biblical allusion to Numbers 12:3: ‘Now the man Moses was very meek’.