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When one person bites the other partners right testicle off and as they swallow are repeatedly hit in the throat as a quarter is inserted past their ovaries. They immediately shit the testicle out at 700 feet per second penetrating a recently dug up dead guys rectum.
Example 1

Guy 1,"Nah dog i'm tired from that gum ball machine Laura gave me last night, I don't wanna do shit."

Example 2

When you are using anal beads on a girl and you cut the string.
After a little snip snip she totally had to do the gum ball machine!
by Captain Compost June 19, 2010
A sex thing in which you put your balls in her butt, then put a quarter in her slot, then she pops out the balls.
My chick pushed to hard when i was gumballing her and she took a dump.

I jizzed when i gumballed my girl.

Gumball Machine is my favorite sex thing to do.
by POWERtehPIMP April 28, 2008