Baseball players are often chewing on tobacco, sunflower seeds, or gum, all of which can make your mouth extremely moist from saliva. Players will often time spit repetitively trying to relieve their wet mouth or do it strictly out of habit.

Why do baseballers chew gum?

Sliding into bases can add dirt to a player's mouth, so chewing gum removes that dirty feeling that players may have. By chewing bubble gum during a game, you create moisture in your mouth and can spit out the dirt during the game. Chewing a new fresh piece of gum can pick up any extra dirt in your mouth too.

What do American baseball players chew and spit out?

The baseball spitting tradition goes back to the 1800s. Players chewed tobacco to build saliva, and used that spit to keep their gloves moist on dusty fields. Tobacco chewing declined after players agreed in 2011 not to chew it in public. Today, players often chew and spit sunflower seeds or gum.