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This is a technique which its user can multiply their power level. This can multiply power and speed. During the Saiyan Saga, King Kai teaches Goku this technique. If you use this technique recklessly, it can put a strain on your body. Blue Kaioken is when Goku added the Kaioken on top of Super Saiyan Blue. Goku originally used the Kaioken against Vegeta. Goku originally planned to use Blue Kaioken against Beerus, but then he used it against Hit.
The kaioken technique is effective due to its multiplying power.
Kaioken by Flash Slash June 8, 2020
From the anime Dragonball Z, Kaioken is the fighting technique taught to Goku (the only one to master this technique) by King Kai. Though King Kai created this technique, he admits that not even he is able to fully master it.

The technique is very similar to going super saiyan, although the power increase is not as high, it is very effective before Goku first transforms. Goku discontinues using the Kaioken attack after his fight with Pikkon, opting instead to attain high super saiyan levels.

The technique only last a few seconds according to Goku so you "have to get the job done quickly". It momentarily greatly increases your speed, strength and abilities, allowing you to achieve a power level unobtainable without the use of this technique.

Through experience and training, the user can achieve multiple 'levels' of Kaioken, increasing the users abilities even further. However, according to King Kai, if you go up too far, your body will not able to handle it, and all the mass in your body will be replaced by energy, thereby making it explode. Goku is able to withstand a 4x Kaioken while fighting Vegeta, (putting his fighting power well over 23,000) in order to counter his Galick Gun attack. However, after this feat his body is thrashed and has no other way of attacking other than using the spirit bomb, another technique exclusive to Goku and King Kai. Cell states that he could use this technique if he wanted to, however.
The Kaioken attack allows you to momentarily take your body far beyond it's natural limits.
Kaioken by kyle.biddle January 7, 2011
A Power Multiplier move in Dragon Ball Z that pretty makes you from trash to beast, it can be times up to 20 but it depletes your stamina and gives a strain to your body so you have to be cautious using it.
KAIOKEN! Kaio-what?

Kaioken x3! Times What?
Kaioken by OhLookIt'sSkelebox March 11, 2019
a technique when a woman concentrates her vagina to tighten or squeeze
Kaioken by the kaioken master April 30, 2016

kroikenspacher

When you get so high you eat your own poop for 2 hours.
I decided to do some kroikenspacher last night and now I think I have diseases.
kroikenspacher by music_boy_1880 November 16, 2018

Kaoinenes 

When someone has a sudden outburst of words, and when it’s over, they forget it ever happened.
Kay-o-nenes
“Wha- Wh- N-, What just happened?” “Omg you just had kaoinenes!”
Kaoinenes by Kamilla & Raavi June 19, 2019