the expression used to describe yourself,
when someone else bites into a citrus fruit,
and you think you get the same tingly feeling, of the juices in your mouth, and shudder.
"Did you see Snow White the other day",
"Yeah, when she bit into the apple I went fizzy".
"I always go fizzy when I see someone bite into an orange"
What this means is that when faced with difficulties and adversity, those who are mentally and physically resilient do not give up, but formulate an effective and disciplined plan of action which they initiate and carry through to a successful conclusion.
"Despite getting stuck with the fallout from Malcolm's fuck-up, Nick got everything sorted inside of a week!"
"Yeah, when the going gets tough, the tough get going."