whoa /wəʊ, həʊ $ woʊ, hoʊ/ 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

[TahlilGaran] Dictionary of Contemporary English ▲