Please note that this is the Narutopedia's article on the collaboration technique. If you are looking for the article on the Hōzuki clan's hiden technique then you should head to Water Gun Technique.
This technique is demonstrated as being both a technique on its own and as a two-way collaboration technique between Gamariki and Jiraiya. Using this technique, Gamariki can blast off a wave of high speed water from his mouth with extreme precision and force. When combined with another person's chakra, this technique becomes a two-way collaboration water technique that can slice the target into multiple fine-carved pieces. After Gamatatsu learns this technique, he is able to combine it with Naruto's wind-natured chakra to create the Wind Release: Toad Gun technique.
Trivia
In Naruto Shippūden: Dragon Blade Chronicles, Naruto and Sasuke are able to perform this technique despite water not being their nature type. Naruto is able to use the technique with his Dragon Blade while Sasuke is able to perform it with a scroll.