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Getting information from the highest authority.

When you get a tip for a horse race, the tip is better as nearer it is to the horse e.g. the jockey or the trainer. When you got it straight from the horse's mouth, you have it directly from the source.
This tip is foolproof, I got it (straight) from the horse's mouth!
by TheSunToucher August 12, 2009
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Get the (straight) from the horse's mouth neck gaiter and mug.
from the most official source(from the fact that a horse's age can be determined most precisely and directly by examining it's teeth)
by Light Joker July 07, 2005
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Get a (straight) from the horse's mouth mug for your brother José.