When you’re getting a blowjob from someone who doesn’t have any teeth and they use their gums instead of their lips for sensation on your cock
Guy 1: “I heard you fucked an old lady last night!”
Guy 2: “Yea she took her dentures out and gave me a gummy fuck!”
When all the Gummy Bears in a package are stuck together.
May also be referred to as a "Bavarian Gummy Bear Cluster Fuck" when aforementioned Gummys Bears are from Germany.
I only want one Gummy Bear but they are all stuck together. It's a Gummy Bear Cluster Fuck.