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1.
When the thought of or actually eating a mega load of Gummy bears is like truly delicious to the extent it is orgasmic!
Jules: mmmm gummi bears

Amanda: He's going through a gummigasm
by Manda Moo is G August 23, 2009
 
2.
The overwhelming rapturous reaction one has when they munch on these delicious little treats.
I had a gummigasm after eating a 5lb bag of white gummy bears.
by incredimus June 23, 2011