Top definition
A type of "working dog"; is trained to blow into the "ignition interlock" system that people charged with drunk driving have to install into their vehicles for it to operate. This system requires the operator to blow into the machine periodically through the course of a drive.

A Blowing Mouth Dog (BMD) can fulfill this duty with some simple training. Most BMDs are from the local pound as they need to be willing to circumvent the law.
Is that a seeing eye dog? Mine is a Blowing Mouth Dog. He helps me drive around town when I have had a few drinks.
by dnads April 28, 2011
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