1. Becoming weak in the knees
2. Eyes rolling back in head and moaning while possibly shouting "this is so fucking good!!"
3. Taste so overwhelming you have to take breaks between bites to keep from shutting your system down.
also, random facial expressions may be included.
"Dude, are you getting a foodgasm?"
"YES. This food's awesome!"
Bill: "Really?" "HAHA!" "What did it look like?"
Mike: "He was sporting the Oh face. A total food-gasm from those blueberry muffins he found in his cabinet!"