look up any word, like usuratonkachi:
 
1.
And exclamation when someone suddenly realizes something isn't right.
Person1- Dude, I like, cha...
Person2- Cool.
Person2- Wait, what?
by Jason44 June 08, 2005
 
2.
A phrase used to back the conversation up when you realize you weren't listening. You caught the ice cream end of the conversation,and oops, you wish you had heard the meat and potatoes. It could be important, so you use this phrase to try and sneak by the fact that you were thinking about dirty pics and bacon cheeseburgers while your friend was pouring their heart out. Hopefully they're so distraught they'll rewind and repeat without noticing.
"........And he left me there all drunk with no shoes and my weave falling out!"
"Wait. What?"
by sugarmonkey April 01, 2008
 
3.
A way of indicating that the thing you or someone else just said makes no sense.
A new law prohibits smoking in restaurants, bars and on the grounds of hospitals and schools. But prisons, psychiatric institutions and retirement homes exempted...

Wait. What?
by tvjames December 22, 2010
 
4.
Mantra of the Attention Deficit Disordered. Literally: stop talking and start over. Needs a good full 1 second pause between words. "wait (one thousand one) what?" and it's vital that eye contact is not made.
" so were both going to have to go in both cars so we can leave one for Will at his work so he won't have to get a ride home."
... ... "wait...what?"
by Kenneth A. Vaughan October 14, 2008