Spraying

Spraying (often associated with the term Spray & Pray) is a technique or action a player may do any time during gameplay. Doing so could help get long-distance kills easily.

How To
Doing so will require a bit of knowledge on the gravity of MCBall Paintballs, or basic snowballs in general. Snowballs go in an arc-shape, once it reaches a distance, it starts to curve back down, instead of going perfectly straight. This is more realistic. Seen in this image provided by JiffaJaffa and TheBombDogs, you could see the arc.

Slightly to the left of the exact middle of the screenshot is where the paintballs start to arc. If you make it arc a little closer, then the paintballs won't go as far. If it arcs from a further distance, the paintballs will stay in air a bit longer.

As demonstrated by TheBombDogs, he has to look/aim a bit more up to make the paintballs go further to hit JiffaJaffa in the back.

Gallery
These are virtually identical screenshots taken within 1 second.