1. To express surprise (interj)

2. To express astonishment(interj)

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)

Whoa 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 is fast."

3. "Whoa, okay, that's enough."

4. "That car is so cool, it's like, whoa."
by Z October 3, 2004
What Keanu Reeves likes to say in most of his movies.
by Matt Eachus March 29, 2004
noise you emmit when you are wasted and watching tv and anything happens.
whoa........did that guy clap and a light turned on??? crazy world.....
by The Palipino August 22, 2003
The extent of Keanu Reeves' vocabulary.
whoa
by Ibeam80 October 21, 2009
"I shot a guy with a flair gun"
"Whoa!"
by TrippleZero May 1, 2005
Said by the character Joey from the failed sitcom Blossom whenever he saw or experienced something unbelievable.
Blossom: Joey, Six has a thing for you.
Joey: Whoa!
by kidgorgeous21 May 16, 2003
a word that is used in the movie Finding Nemo.
"You were like WHOA! and then we were like WHOOOA! and then you were like whooa..."
by Thrashmeister November 10, 2004