DUDE WHAT is used by gamers all over the world. Typically used by online gamers because of the very fact they cannot pause the game. The subject is typically distracted by someone calling them on their cell phone, or their mom telling them that dinner is ready, or just an annoying friend. DUDE WHAT is typically a very abrupt phrase used immediately after the gamer dies because of the distraction. The gamer will use this phrase out of complete anger.
Friend: dude! check out this youtube video!
gamer: hold on! im leveling!
Friend: check it out! your gonna miss it! look! look! look!
gamer: DUDE WHAT!? ive already seen that video!!!!!
friend: dang.....i gotta go......