Bellygasm
Main Entry: bel·ly·gasm
Pronunciation: \ˈbe-lē-ˌga-zəm\
Function: noun, intransitive verb
: "when someone has eaten something that tastes so good it's as if they're stomach has had an orgasm."
"whoa! that steak was so tender and that peanut butter ice cream was so smooth i just had a bellygasm!"
Source: Urban Dictionary