To stare at someone while giving dirty looks as a way to intimidate or initiate a fight.
Type 1:"them boys are bogging out us"
Type 2:"I wanna have a scrap with those boys lets bog them out"
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Used in the UK and is an abbreviation of "gang member" often used to describe rival gangs or others from within the speakers own gang.
Type 1:"there a couple of GMs on their strip"
Type 2:"I'll slide round there with my GM."
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