Top Definition
Used by probationers who aren't allowed to drink alcohol to explain why they fail breathalyzers. Similar to the toothpaste defense, the cough syrup defense, and the hand-sanitizer defense, the latter of which only applies to ETG tests (Urine alcohol tests).
Probation officer: You failed your breathalyzer.

Probationer: I didn't drink alcohol, I just used mouthwash before I came here.

Probation Officer: That's the mouthwash defense. It's bullshit and you know it. You're going to jail.
by Lupara2012 August 01, 2012

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