Defined as someone from a rival gang and/or an enemy or someone you despise. Usually someone not part of your Mandem.
"Nah man this is the opp boy's block"
by UK Meanings January 21, 2021
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Insult - A term used to describe someone who is a cross between a snake and a wasteman.
He's an Opp Boy

He is moving like an Opp
That is Opp Boy movements
by GiveMeaYard June 1, 2018
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