A serum that is more than just gibberish attacking your brain whenever the serum resembles. It can obviously make you crazy for all the sudden, usually, the serum is seen when Tom from Eddsworld has the serum when he is more than just talking gibberish.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".