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1.
Someone who has given, or regularly gives oral to guys.
"I heard that Kristina gave head to John at the party on Friday."

"Wow, what a gumdinger."

or...

"Last night some chick gave me Gumding!"

"Who was the Gumdinger?"
by filling the hole in your box June 02, 2007
 
2.
a blow job
that chick gave me a gum dinger
by Martycz02 December 23, 2008
 
3.
The act of a woman inserting a male reproductive organ inside their mouth continuously in and out. Or in other words...a blow job
Bobby: Yo, we better be gettin some action at this party tonight bro!
Jake: Hell ya bro, these chicks love givin the Gum Dingers!
by Kahl21 January 20, 2011
 
4.
head, bj, oral....all the same....its a gumdinger
Yo, how that work out for you last night with that chick
Well she gave me a nice gumdinger, so cant complain much
by GumdingFanatic May 04, 2009
 
5.
someone who regularily gives blowjobs to males
Hasan loves giving blowjobs. He is the number one gumdinger in Thunder bay!!
by peja33 April 22, 2011