Primarily used when a friend commits a digression against you (e.g. embarrassing you in front of a potential romantic partner) or breaks omertá, rewengay is simply the act of getting revenge that is completely out of proportion.
After pulling aside bed covers to reveal meat in the shape of the word 'JUDAS'
Mark: How did you--? What does it mean?!
Jez: It means omertá. It means rewengay.
Mark: How did you--? What does it mean?!
Jez: It means omertá. It means rewengay.
by Jeremy Usbourne October 8, 2018
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