In a chemical compound, a carbon atom that has 5 bonds and does not exist in practice - Carbon bonds usually only have 4 bonds. Created from a bathroom stall wall in the University of Michigan Chem Building.
Prof. Karatjas likes to make his tests so hard, you might encounter a texas carbon.
Joe: Dude this is the answer fo sho.
John: Dude, wtf, thats a texas carbon.
Joe: Oh shit...