From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Meta-Cooler creates a small amount of sparkling energy in front of his face. He then shouts, "I got you!" and fires a fast-moving energy beam that leaves behind a sparkling trail and creates a huge blinding explosion upon impact.
Meta-Cooler used this attack in his battle against Son Goku and Vegeta in their Super Saiyan forms in Dragon Ball Z: The Return of Cooler. After avoiding Super Saiyan Vegeta's Big Bang Attack using his Instant Transmission, Meta-Cooler appeared and kneed Super Saiyan Vegeta in the stomach, surprising and temporarily knocking out the Saiyan prince. Using his cybernetic modifications to locate Super Saiyan Goku, Meta-Cooler punched Super Saiyan Vegeta towards Super Saiyan Goku and fired the Lock-On Buster at both of them, leaving them moderately injured.