1. Any of various lively dances in triple time.
2. To dance or play a jig.
3. To move or bob up and down jerkily and rapidly.
4. A joke or trick.
I said earlier that Squirrelpower was "jigging down the road". Above are the dictionary's definitions, most of which do get across the general idea I was trying to convey. Mostly I was using the word in reference to what horses do when they don't want to walk quietly down the trail, and instead jump and prance every which way except the one that you want them to go. Horse people call this annoying behavior "jigging".