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The opposite of a green thumb; a person who doesn't know his brass from his oboe about taking care of plants.
Who are you giving that tree to? I wouldn't trust Lana. She's a brown thumb. You give her any plant, it'll be dead in one day!
by pentozali December 20, 2007
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The act of waking up early, dropping the dugan of your life, and then frantically wiping to complete the experience; unfortunately when wiping the excess remains on your thumb.
Dude, I passed the most amazing BM that there was nothing that I could do to avoid the Brown Thumb.

(calling best friend) {You} You would not believe what happened this morning. {Friend} I cant talk. {You} It involves the brown thumb. {Friend} I've got time for that. Tell me more.
by +8 January 08, 2009
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A recently formed yet very successful gang based out of Jensen Beach, Florida. With branches spreading as far as Orlando. The gang consist of many key members such as: Thumb Master Poo, Squirts, Big Dump, and Smelly Mike. Also there is rumor of the gang releasing a new album called 'Under My Thumb' with a potential hit single called 'We Just Thumb'n'. Ways to identify a Brown Thumbs member is a BT located on their neck as well as their thumb tattooed brown.
Yo, watch out for them brown thumbs. They'll shit on you.
by Thumb Master Poo February 15, 2015
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