1 definition by thestew69

Top Definition
the adequate word coined for a true blooded pure bro. Also known as a brospawn through the lineage of true bros. Thoroughbros are now increasing in number due to the raising rate of bromance, but the cost of being a bro is still eternal.
did you see that thoroughbro in his sweet patagonia hat?
by thestew69 November 14, 2010
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