The article talks about "paper airplane folding gun", which takes sheets of paper as ammo, folds them into paper airplanes using a series of rollers, and launches them through the front. But the article uses an expression I don't understand.
The maker behind the project is keeping his lips sealed, but a video featuring the gun in action is currently available on YouTube. The gun can fold and fire paper airplanes in about two sections a pop, so watch out backyard gamers – these are dangerous patches of grass.
What does it mean?