When you do really well at something in practice (like beating top players in Super Smash Bros. Melee), but fail to do it when it matters the most (like when you finally fight that top player in bracket)
Meleegamer123: "I beat Hungrybox on slippi! I'm so good at melee"
Meleegamer456: "No you aren't dude, that's just The Hbox Effect"
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".