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3.
When a girl with pigtails is giving you a blow job and right before you're about to cum, you pull her pigtails up, spray all over her hair and let out a nice operatic-viking "Ahhhhhhhh".

With her pigtails up, it looks like she's wearing one of those helmets you'd see in a viking opera.
This cutie was giving me a nice BJ and I just had to finish by giving her a viking helmet.
by AR. July 18, 2006
 
1.
Placing ones penis on a girls face so it rests straight down the bridge of her nose.
Lay down with your head off the side of the bed so I can give you the viking helmet.
by 313 October 23, 2004
 
2.
A piercing through the penis head consisting of a half ring with pointed ends, thus resembling the helmet of an (operatic) Viking.
Guy A: "Dude, check out my Viking Helmet"

Guy B: "What? Aww man, I didn't wanna see your junk...but that is pretty awesome."
by s7ryph November 22, 2010