They also say ‘stats’ when referring to the disipline of statistics, whereas we only say it when referring to the data themselves.
You become accustomed to ‘maths’ and ‘stats’ after you’ve been around Brits long enough. But personally, I don’t think I could ever become so accustomed to them I’d use them myself. Although some Americans do, especially when speaking with Brits.
Just remember, we say ‘physics’ without batting an eye. In fact, ‘physic’ would be plain flat-out wrong when referring to the science of physics.
It's pretentious and uber-gay. It's like saying, "Lunch? Sure, let me check my shed-jewel."