Lively, energetic, and full of enthusiasm or spirit; quick-witted and clever.
From 'spark' (a small glowing particle), with the -y suffix. It originally referred to something that produces sparks, but evolved to describe energetic, lively people.
Electricity jumps through the air as 'sparks,' and calling someone 'sparky' compares their energy to that electric spark—it's actually a pretty scientific way to describe high energy!
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