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15.
A move from street fighter video game. The main character Ryu had invented the hadouken to protect all citizens from the forces of evil and mercenary armies. Ryu was a master of karate who joined up with a band of freedom fighters to protect and same the world from evil humans and spirits called akuma. In order to defeat these enemies Ryu created the hadouken to combat their spiritual powers and even sometimes cancel all of their abilities in general. PRetty much one of the most powerful moves in the street fighter genre or series if yopu want to call it that. Also recently the hadouken has been used in multiple of other fighting games and has been mentioned in several movies, some made from the series and some make a play or joke of it. Also Hadouken is also a very large Call of Duty clan.
Dude Ryu just used the hadouken to smash Commander Sheppard's dick.

Combo: XXBXA on X-box 360 creates the ultimate Hadouken to slay your enemies.
by The Flying Space Chimp October 15, 2013
 
16.
A fingering technique were the thumb is used to stimulate the G-spot, with the fingers wrapped over the pubic bone. When done with two hands (the second thumb goes in the anus) it looks like Ryu from Street Fighter throwing a hadouken.
Nick... "How do you make a girl squirt?"

Adam... "Just use the hadouken!"
by theBSCshow May 17, 2011
 
17.
Down-DownTwoards-Forward + Punch ---HADOUKEN----Essentially it's a blue fireball that emerges from between the two open palms held together at the wrist of an assailant. It causes severe damage to your health and cannot be blocked. You can, however, leap over it but you must get the timing right.
OLD SCHOOL...AHHH they knew how to do it back then!
it's actually from Street Fighter the video game...so users of the word will be familiar...I just HADOUKEN his ass...took his life!
by Samir Mansour March 08, 2008
 
18.
When you "stop" at a four way intersection and then proceed to do a 360 around all the stop signs so you end up going in the opposite direction.
"Oh shit, did you see that guy do a 360 around the stop signs?"

"Yeah, he totally hadoukened that shit up"
by Spanko April 27, 2010
 
19.
A special attack introduced in the popular fighting game "Street Fighter" made by Capcom and has since become a staple to the series. It is known to be used by Ryu, Ken, and Akuma. A similar strike can be performed by Dan as well.
The attack itself is a projectile of fire/ether emitted from its casters palms and travels in a forward direction.

Hadouken can also refer as a social status designating your cool credibility.
I will spam my hadoukens across the stage so you can't come near me!

Eddy is soooo hadouken for pimp smacking that girl when she cheated on him. He is so down-right fierce!
by Alexis Monsivaiz January 01, 2009
 
20.
the act of double fisting someone, so that the arms look like Ryu's from street fighter, only inside another persons body. Can be done double vaginal, double anal, or mix-and-match.

"What were you doing when I walked in, you looked wrist deep?!"
"I was, man. Totally gave her the hadouken."
"Victory!"
by CaptSkubba February 05, 2009
 
21.
Down-DownTwoards-Forward + Punch

In a nut shell it's a fireball, however it's not so much fire as it is ki.
He was hit by a hadoken and know he's dead.
by sir December 17, 2003