whoa /wəʊ, həʊ $ woʊ, hoʊ/ BrE AmE interjection
[ Date: 1800-1900 ; Origin: ho ]
1 . used to tell someone to become calmer or to do something more slowly:
Whoa! You’re driving too fast.
2 . said to show that you are surprised or that you think something is impressive:
Whoa. That’s a lot of money.
3 . used to tell a horse to stop