From the series of Sherlock BBC. Originally Sherlocked, which means to be obsessed/in love with Sherlock. Johnlock means you ship Johnlock (John and Sherlock) very hard.
Friend: OMG I just finished watching Sherlock and i love it!
Friend 2: Do you shipJohnlock?
Friend: Bitch, please I am Johnlocked!
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".