Master Boot licker. One who licks boots so much that their tongue has turned black from the shoe polish.
Chad got another promotion today, he is such a black tongue.
by zeusofcrete December 19, 2021
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Used to describe when a person says something out loud and it manifests as reality and comes true. Black Tongue *bluh-a-ck Tung*
This asshole has a black tongue. Every time he opens his mouth the shit comes true —-I wish he would shut the hell up or say he wishes I was rich and happily retired.
by Amoritito August 12, 2021
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A girl who chain smokes, gives head and then refuses to brush her teeth.
I saw Kayley leave Jeremy's room and chain smoke a carton of Camels. She's such a black tongue slu.
by AnonymousTruthBeTold March 3, 2010
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1. A benign (but disgusting) bacterial growth in the mouth that causes the tongue to become black and fuzzy. May spread to the teeth.

2. The grossest thing ever.

3. The side effect listed on the back of Pepto-Bismol packaging as "a harmless darkening of the tongue."

4. The #1 reason to never take Pepto-Bismol.
You: I woke up this morning with Black Hairy Tongue.
Friend: Ew. You shouldn't have taken pepto before bed!
by Kiwi27777 December 13, 2009
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