1 definition by Spaceman Ninja

Top Definition
A congratulatory term, for fellow friends.

Usually if someone has just said something wise and clever

Originated from "our boy" and "that our boy!" and "outta boy"
Man 1: I just got two tickets to go see Jimmy Carr! Front seats!

Man 2: Ah boi!
by Spaceman Ninja January 25, 2009
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