From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
See Ya! (じゃあ な!, Jā Na!) is a rush attack used by Imperfect Cell. First, Imperfect Cell charges at the opponent and punches them away onto the ground. Next, he walks toward the opponent and picks them up with his left hand as he places his right hand over their chest. Finally, Imperfect Cell shouts, "See you!" as he fires a large yellow energy wave through the opponent's chest, inflicting a massive amount of damage.
Imperfect Cell used this attack to defeat Piccolo. When Imperfect Cell withstood Piccolo's Light Grenade, Piccolo told Artificial Human No. 17 to run so he could avoid being absorbed. However, Imperfect Cell interrupted Piccolo by attacking him with the "See Ya!" rush, breaking his neck, throwing him into the ocean, and nearly killing him. Piccolo survived due to his regeneration and was soon rescued by Son Goku, who took him along with Tien back to Kami's Lookout to recover.