What is Fus Ro Dah?

Fus Ro Dah is the first shout in the game you learn: Unrelenting Force.

It sends enemies staggering back, and was first used in the Skyrim Trailer.

The trailer, however, doesn't do a very good job of capturing the feel of a "proper" Fus Ro Dah.

I direct you here:

So in conclusion - I would not FUS RO DAH my car to the mechanic, unless you wanted to buy a new car.

In the game the player takes the role of a Dragonborn, a mortal who born with the blood and soul of a dragon, who can learn a slain dragon's knowledge by absorbing it's soul. They can use Dragon Shouts (Thu'um) which are actually ancient and powerful words in Dragon Language. Each word has another effect and they can be empowered with combining them with other words. Unrelenting Force "Fus Ro Dah" is the first Dragon shout the player learns in the game. Fus means "Force". Ro means "Balance" and Dah means "Push". The effect of the shout varies, Fus will only stagger enemies in front of the player, "Fus Ro" will push back, "Fus Ro Dah" will send them in the air flying.

But it became very popular on the internet and people started making parody videos using the sound of "Fus Ro Dah" shout from the official gameplay trailer. It's like something both cool and funny at the same time. Like "This is Sparta !" from the 300.