This technique was used by Son Gohan occasionally when he was a child. As it is also a Namekian Warrior skill in Dragon Ball Online, it's implied that Piccolo taught him this ability and it may have been his first chi exertion technique.
Dragon Ball OnlineEdit
This skill is learn-able from level 18 by Warriors as a branch-off of the Masenko skill.
This HTB skill features a Masenko about halfway through. It is learned at level 30 by Warriors.