There is a quest called Post-Partum Aggression (Approx lvl 76-78)
Post-partum Aggression - Quest - World of Warcraft
Well in this quest you get to ride the mammoth over to kill a dragon. Well there is an extra attack "War Stomp" if you press "7%26#8243; on your keyboard. You cannot click it because it isn't on the action bar, But if you press 7 you get to cast it.
Oh i know, SS or didn't happen so here ya go, Clearly the aoe dmg in the picture is War Stomp!
http://i85.photobucket.com/albums/k68/streetska8er/Warstomp.png
by Scrubs