the operative suffix here would be "-asm," not "-gasm."

Therefore the word should be taken as a portmanteau word rather than whatever we would call it if it were merely made up of existing lexemes. With out the g it wouldn't have the nuance of meaning. And while it may not be in the same league as a sexual orgasm, it is at least playing the same game. I haven't eaten any of Father Steve's cooking but I have had food that was so exquisite that I was unable to do anything meaningful but experience the food. Foodgasm may be a little too clunky to describe this feeling but, until something better comes along, it works for me.

I'll have whatever she's having.