i.e., if someone asks for some gum, you say no, but i've got a gumball, you want that.....then if they say yes show 'em your ball!
By Harrie
Gumball
When a girl gives you head whilst chewing a piece of gum and said piece of gum gets stuck to your balls and penis, resulting in a very painful removal process.
Steve: yo this girl last night was givin me head and she gumballed me
Jim: oh shit taht sucks bro, did it hurt?
Steve: Yeah especially when all my pubes got pulled out tryin to get the gum out