Green Light- Jessie Hall

Has anyone read Green Light yet?? There's one part that is really confusing me that I was hoping someone could help me understand. It's when Montana is talking to Wheeter about Shane and Wheeter says, "Croix just seems to have strong negative emotions when it comes to all things Money Shot." How does Wheeter know that's Montana's nickname? I thought it was just Montana's nickname from her friend Markie?