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2.
A person that supplies gum to everyone; The person that always has gum to share or give out; persons that sling gum.

Background: Friend and I thought of it and thought it was funny at the time.
A gumballer is someone that always has that stick of gum when you really need it.
by Brian Carmona June 05, 2004
 
1.
A person who has participated in the infamous Gumball 3000 supercar rally.
Whether they're a millionaire, celebrity or athlete, the two things Gumballers have in common is a passion for travel and cars.
by Pavo Jr. October 18, 2013