The ability to make an NES game work when it will not load properly. This can be achieved to pushing it in lightly, slamming it down, or, the classic blowing into the cartridge.
This problem often occurs due to the age and condition of the cartridge.
Aaron: "Damn! Mike Tyson's Punch Out won't work! I've tried everything!"
Bill: "It's okay man, let Mark try it, he's got the Nintendo touch"