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"WAGHHH" is a special term used by Ork from Dawn of War:Warhammer40k, to be specific, it means "War". Orks will shout this word while they engages with the enemy.

In addition, Waghhh is also written on Waghhh Banners to increase Ork morale.

Search for "Ork Slangs" on urbandictionay.com for more.

Also see Boyz, Ork, Gorkamorka, Dakka, Tankbusta,Shoota,Choppaz, Warboss, Big Mek, Nobz, Grot and gretchin,
Warboss : WAGHHH! Let'z rumble over those spiky boyz!
Big Mek : Let me give ya' a thumb! Thos' are grethins!
by Your Neighbour October 15, 2005