1. To express surprise (interj)
2. To express astonishment
3. To indicate a desire for one to end that of which they are speaking (interj)
4. Evolved from a song to describe something that you're not quite sure exactly how to describe (adj)
can also be spelled "woah" though there are many arguments started by bored people
about which way is correct.
1. "Whoa! Don't do that
, you scared me."
2. "Whoa, that roller coaster
3. "Whoa, okay, that's enough
4. "That car is so cool, it's like, whoa."