A suffix that can be attached to just about any noun in the English language.
You can have a shoegasm, chocogasm, hottiegasm, hippiegasm, musigasm, artgasm.
Whatever makes you "cream your jeans", persay. Just shorten the word up and stick gasm on the end and you can use it as a noun.
"I had a total Musigasm when I went to the String Cheese Incident show at Bonnaroo."