From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Yajirobe charges a small energy sphere and, after a second, swiftly swipes his sword and sends an unblockable, thin, sharp wave of ki to slash his opponent. As it is unblockable, one can only dodge it to avoid taking heavy damage.
Ka-Blam Slicer is named in Dragon Ball Z: Budokai Tenkaichi 2. It is used in Dragon Ball Z: Budokai Tenkaichi 2 and Dragon Ball Z: Budokai Tenkaichi 3 and is Yajirobe's Blast 2 attack. Future Trunks Brief uses a similar technique named the Crescent Sword in Dragon Ball Z: Supersonic Warriors 2.