blowing dirty

When you fail or know you would fail a breathalyzer test.

"Jimmy got pulled over last night, he blew dirty."
"I woke up this morning still blowing dirty."

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blowin' dirty

when an individual would not pass a breathalizer test.

"Hammer got pulled over last night, he was blowin' dirty."

"I feel like shit this morning, I'm still blowin' dirty."