Use 'aflutter' to describe a very lively emotional state that's typically positive or expectant. Minutes before the performance, her nerves were aflutter with anticipation.
Pro Tip 2/3
Metaphorical Use
'Aflutter' can be metaphorical, referring to feelings rather than actual movement. His heart was aflutter upon hearing her voice.
Pro Tip 3/3
Positive Contexts
The context 'aflutter' is used in is often positive, like excitement before an event. The children were all aflutter on the night before the trip.