What

What means something that is used to ANNOY the heck out of someone.

Richard: hey jorge did you like the movie?
Jorge: whaaath!
Richard: did you like the movie?
Jorge: whaaath!
Richard: DID YOU LIKE THE MOVIE YES OR NO!!!!!
Jorge: whaaath!
Richard: YOU KNOW WHAT FORGET IT!!!
Jorge: just to let you know the movie was great!