[That whole mental process is so easily read that Sombra has to try really hard not to laugh even harder. It'll probably just piss her off anymore. Which isn't her fault, but she's not here to offend everyone at once.]

Because that's what gum is for? I know, it makes like zero sense, I have to admit. You chew it and then when you don't want it anymore you just spit it out in the trash. Or if you want to be a real cabrón you stick it on the most inconvenient place possible.