Top Definition
'A's' refering to drugs of a Class A nature (UK drugs laws) and 'Bustin' open' meaning to open and then consume.

In some cases the phrase may be intended to mean bustin' open someones A hole and giving it a good pounding.
Word up homie, fancy heading back to my crib and bustin' open some A's?
by Henry Smith August 26, 2004

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