Top Definition
1. A fast powerful uppercut to the stomach that makes a thunderous sound upon contact. Originated from hard punches that were from DBZ.

2. A hit (usually a uppercut to the stomach) strong enough to end a fight in one hit and leaves the receiver writhing in pain.
Dave: "I'm sick of my little brother talking mess."

Justin: "Just give him a z blow to the face and he'll shut up."
by Metabashi July 17, 2010

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