When the loose skin of one's testicles is bunched up, and made to look like a chewed piece of gum.
Male 1: "Hey bro, want some stubble bubble?"
Friend: "Ye-- Ew what the fuck?!"
1👍 3👎
An aggravated ingrown hair that has resulted in a whitehead or a cyst on the face.
That's a mad stubble bubble you got on your forehead fam.