Skewer! is one of General Blue's special attacks. Blue uses his Look into my eyes! technique on his opponent, which leaves them paralyzed, and then he takes a sharpened tree and slams it into his opponent.
Skewer! is named in Dragon Ball Z: Budokai Tenkaichi 3, where it is one of General Blue's Blast 2 attacks. Blue also uses it in Dragon Ball: Origins 2. In Budokai Tenkaichi 3, Skewer! is basically the same technique Guldo used against Krillin and Gohan, except Blue physically throws a tree at his opponent instead of throwing via telekinesis. Skewer!, like Guldo Special, is based on a failed attack.