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1.
Verb: The act of oral sex with an elderly person, who forgot to put their dentures in, while they gnaw and bite on the other person's genitals.
"Dude, last night I got gummed!"
by Jewsaint April 05, 2010
 
2.
Putting your chewed gum on someone else's windshield, car door, car handle, or under their car handle so that that person must then touch your chewed gum in order to remove it from their car.
You just totally gummed that car!
by Dahme February 17, 2007